SECTION 7.1 Exercises

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Printed Page 428SECTION 7.1 ExercisesFor Exercises 1 to 4, identify the population, the parameter, 3. the sample, and the statistic in each setting.1.Stop smoking! A random sample of 1000 people who signed a card saying they intended to quit smoking werecontacted nine months later. It turned out that 210 (21%) of the sampled individuals had not smoked over the past sixmonths.pg 4162.Unemployment Each month, the Current Population Survey interviews a random sample of individuals in about 55,000U.S. households. One of their goals is to estimate the national unemployment rate. In December 2009, 10.0% of thoseinterviewed were unemployed.3.Hot turkey Tom is cooking a large turkey breast for a holiday meal. He wants to be sure that the turkey is safe to eat,which requires a minimum internal temperature of 165 F. Tom uses a thermometer to measure the temperature of theturkey meat at four randomly chosen points. The minimum reading in the sample is 170 F.4.Gas prices How much do gasoline prices vary in a large city? To find out, a reporter records the price per gallon of regularunleaded gasoline at a random sample of 10 gas stations in the city on the same day. The range (maximum – minimum)of the prices in the sample is 25 cents.For each boldface number in Exercises 5 to 8, (1) state whether it is a parameter or a statistic and (2) use appropriate notation todescribe each number; for example, p 0.65.5.Get your bearings A large container of ball bearings has mean diameter 2.5003 centimeters (cm). This is within thespecifications for acceptance of the container by the purchaser. By chance, an inspector chooses 100 bearings from thecontainer that have mean diameter 2.5009 cm. Because this is outside the specified limits, the container is mistakenlyrejected.6.Florida voters Florida has played a key role in recent presidential elections. Voter registration records show that 41% ofFlorida voters are registered as Democrats. To test a random digit dialing device, you use it to call 250 randomly chosenresidential telephones in Florida. Of the registered voters contacted,33% are registered Democrats.7.Unlisted numbers A telemarketing firm in Los Angeles uses a device that dials residential telephone numbers in that cityat random. Of the first 100 numbers dialed, 48% are unlisted. This is not surprising because 52% of all Los Angelesresidential phones are unlisted.8.How tall? A random sample of female college students has a mean height of 64.5 inches, which is greater than the 63inch mean height of all adult American women.9.pg 419Doing homework A school newspaper article claims that 60% of the students at a large high school did all theirassigned homework last week. Some skeptical AP Statistics students want to investigate whether this claim is true, sothey choose an SRS of 100 students from the school to interview. What values of the sample proportionTo findout, we used Fathom software to simulate choosing 250 SRSs of size n 100 students from a population in which p 0.60. The figure below is a dotplot of the sample proportion ôop of students who did all their homework.

(a) Is this the sampling distribution of ôop? Justify your answer. (b) Describe the distribution. Are there any obvious outliers? (c) Suppose that 45 of the 100 students in the actual sample say that they did all their homework last week.What would you conclude about the newspaper article’s claim? Explain.10. Tall girls According to the National Center for Health Statistics, the distribution of heights for 16-year-old females ismodeled well by a Normal density curve with mean μ 64 inches and standard deviation σ 2.5 inches. To see if thisdistribution applies at their high school, an AP Statistics class takes an SRS of 20 of the 300 16-year-old females at theschool and measures their heights. What values of the sample mean X would be consistent with the population distributionbeing N(64, 2.5)? To find out, we used Fathom software to simulate choosing 250 SRSs of size n 20 students from apopulation that is N(64, 2.5). The figure below is a dotplot of the sample mean height X of the students in the sample. (a) Is this the sampling distribution of X ? Justify your answer.(b) Describe the distribution. Are there any obvious outliers?(c) Suppose that the average height of the 20 girls in the class’s actual sample is X 64.7. What would youconclude about the population mean height μ for the 16-year-old females at the school? Explain.

11.Doing homework Refer to Exercise 9. (a) Make a graph of the population distribution given that there are 3000 students in the school.(Hint: What type of variable is being measured?) (b) Sketch a possible graph of the distribution of sample data for the SRS of size 100 taken by the AP Statisticsstudents.12.Tall girls Refer to Exercise 10. (a) Make a graph of the population distribution.(b) Sketch a possible graph of the distribution of sample data for the SRS of size 20 taken by the AP Statisticsclass.Exercises 13 and 14 refer to the following setting. During the winter months, outside temperatures at the Starneses’ cabin inColorado can stay well below freezing (32 F, or 0 C) for weeks at a time. To prevent the pipes from freezing, Mrs. Starnes sets thethermostat at 50 F. The manufacturer claims that the thermostat allows variation in home temperature that follows a Normaldistribution with σ 3 F. To test this claim, Mrs. Starnes programs her digital thermometer to take an SRS of n 10 readingsduring a 24-hour period. Suppose the thermostat is working properly and that the actual temperatures in the cabin vary accordingto a Normal distribution with mean μ 50 F and standard deviation σ 3 F.13.Cold cabin? The Fathom screen shot below shows the results of taking 500 SRSs of 10 temperature readings from apopulation distribution that’s N(50, 3) and recording the sample variance each time.(a) Describe the approximate sampling distribution.(b) Suppose that the variance from an actual sample ismanufacturer’s claim? Explain. 25. What would you conclude about the thermostat

14.Cold cabin? The Fathom screen shot below shows the results of taking 500 SRSs of 10 temperature readings from apopulation distribution that’s N(50, 3) and recording the sample minimum each time. (a) Describe the approximate sampling distribution.(b) Suppose that the minimum of an actual sample is 40 F. What would you conclude about the thermostatmanufacturer’s claim? Explain.15. Run a mile During World War II, 12,000 ablebodied male undergraduates at the University of Illinois participated inrequired physical training. Each student ran a timed mile. Their times followed the Normal distribution with mean 7.11minutes and standard deviation 0.74 minute. An SRS of 100 of these students has mean time X 7.15 minutes. A secondSRS of size 100 has mean X 6.97 minutes. After many SRSs, the values of the sample mean X follow the Normaldistribution with mean 7.11 minutes and standard deviation 0.074 minute. (a) What is the population? Describe the population distribution.(b) Describe the sampling distribution of X . How is it different from the population distribution?16.Scooping beads A statistics teacher fills a large container with 1000 white and 3000 red beads and then mixes the beadsthoroughly. She then has her students take repeated SRSs of 50 beads from the container. After many SRSs, the values ofthe sample proportion ôop of red beads are approximated well by a Normal distribution with mean 0.75 and standarddeviation 0.06. (a) What is the population? Describe the population distribution. (b) Describe the sampling distribution of ôop. How is it different from the population distribution?17.IRS audits The Internal Revenue Service plans to examine an SRS of individual federal income tax returns from eachstate. One variable of interest is the proportion of returns claiming itemized deductions. The total number of tax returns ineach state varies from over 15 million in California to about 240,000 in Wyoming. (a) Will the sampling variability of the sample proportion change from state to state if an SRS of 2000 taxreturns is selected in each state? Explain your answer.(b) Will the sampling variability of the sample proportion change from state to state if an SRS of 1% of all tax

returns is selected in each state? Explain your answer.18.Predict the election Just before a presidential election, a national opinion poll increases the size of its weekly randomsample from the usual 1500 people to 4000 people. (a) Does the larger random sample reduce the bias of the poll result? Explain. (b) Does it reduce the variability of the result? Explain.19.pg 427Bias and variability The figure below shows histograms of four sampling distributions of different statistics intended toestimate the same parameter.

(a) Which statistics are unbiased estimators? Justify your answer. (b) Which statistic doesthebest job ofestimating the parameter? Explain.20. A sample of teens A study of the health of teenagers plans to measure the blood cholesterol levels of an SRS of 13- to16-year-olds. The researchers will report the mean X from their sample as an estimate of the mean cholesterol level μ in

this population. (a) Explain to someone who knows no statistics what it means to say thatXis an unbiased estimator of μ.(b) The sample result X is an unbiased estimator of the population mean μ no matter what size SRS the studychooses. Explain to someone who knows no statistics why a large random sample gives more trustworthyresults than a small random sample.Multiple choice: Select the best answer for Exercises 21 to 24.21.A newspaper poll reported that 73% of respondents liked business tycoon Donald Trump. The number 73% is (a) a population. (b) a parameter. (c) a sample. (d) a statistic. (e) an unbiased estimator.22.The name for the pattern of values that a statistic takes when we sample repeatedly from the same population is (a) the bias of the statistic. (b) the variability of the statistic. (c) the population distribution. (d) the distribution of sample data. (e) the sampling distribution of the statistic.23.If we take a simple random sample of size n 500 from a population of size 5,000,000, the variability of our estimate willbe (a) much less than the variability for a sample of size n 500 from a population of size 50,000,000. (b) slightly less than the variability for a sample of size n 500 from a population of size 50,000,000. (c) about the same as the variability for a sample of size n 500 from a population of size 50,000,000. (d) slightly greater than the variability for a sample of size n 500 from a population of size 50,000,000. (e) much greater than the variability for a sample of size n 500 from a population of size 50,000,000.

24.Increasing the sample size of an opinion poll will (a) reduce the bias of the poll result. (b) reduce the variability of the poll result. (c) reduce the effect of nonresponse on the poll. (d) reduce the variability of opinions. (e) all of the above.25.Dem bones (2.2)Osteoporosis is a condition in which the bones become brittle due to loss of minerals. Todiagnose osteoporosis, an elaborate apparatus measures bone mineral density (BMD). BMD is usually reported instandardized form. The standardization is based on a population of healthy young adults. The World Health Organization(WHO) criterion for osteoporosis is a BMD score that is 2.5 standard deviations below the mean for young adults. BMDmeasurements in a population of people similar in age and gender roughly follow a Normal distribution. (a) What percent of healthy young adults have osteoporosis by the WHO criterion?(b) Women aged 70 to 79 are, of course, not young adults. The mean BMD in this age group is about –2 on thestandard scale for young adults. Suppose that the standard deviation is the same as for young adults. Whatpercent of this older population has osteoporosis?26.Squirrels and their food supply (3.2)Animal species produce more offspring when their supply of food goes up.Some animals appear able to anticipate unusual food abundance. Red squirrels eat seeds from pinecones, a food source thatsometimes has very large crops. Researchers collected data on an index of the abundance of pinecones and the averagenumber of offspring per female over 16 years.3 Computer output from a least-squares regression on these data and aresidual plot are shown on the next page.

(a) Give the equation for the least-squares regression line. Define any variables you use. (b) Explain what the residual plot tells you about how well the linear model fits the data. (c) Interpret the values of r2 and s in context.SECTION 7.1Exercises

Printed Page 428SECTION 7.1 SolutionsFor Exercises 1 to 4, identify the population, the parameter, 3. the sample, and the statistic in each setting.1.Stop smoking! A random sample of 1000 people who signed a card saying they intended to quit smoking werecontacted nine months later. It turned out that 210 (21%) of the sampled individuals had not smoked over the past sixmonths.pg 416Correct AnswerPopulation: people who signed a card saying that they intend to quit smoking. Parameter of interest: proportion of the populationwho signed the card saying they would not smoke who actually quit smoking. Sample: a random sample of 1000 people whosigned the cards. Sample statistic:.2.Unemployment Each month, the Current Population Survey interviews a random sample of individuals in about 55,000U.S. households. One of their goals is to estimate the national unemployment rate. In December 2009, 10.0% of thoseinterviewed were unemployed.3.Hot turkey Tom is cooking a large turkey breast for a holiday meal. He wants to be sure that the turkey is safe to eat,which requires a minimum internal temperature of 165 F. Tom uses a thermometer to measure the temperature of theturkey meat at four randomly chosen points. The minimum reading in the sample is 170 F.Correct AnswerPopulation: all the turkey meat. Parameter of interest: minimum temperature. Sample: 4 randomly chosen points in the turkey.Sample statistic: sample minimum 170 F.4.Gas prices How much do gasoline prices vary in a large city? To find out, a reporter records the price per gallon of regularunleaded gasoline at a random sample of 10 gas stations in the city on the same day. The range (maximum – minimum)of the prices in the sample is 25 cents.For each boldface number in Exercises 5 to 8, (1) state whether it is a parameter or a statistic and (2) use appropriate notation todescribe each number; for example, p 0.65.5.Get your bearings A large container of ball bearings has mean diameter 2.5003 centimeters (cm). This is within thespecifications for acceptance of the container by the purchaser. By chance, an inspector chooses 100 bearings from thecontainer that have mean diameter 2.5009 cm. Because this is outside the specified limits, the container is mistakenlyrejected.Correct Answerμ 2.5003 is a parameter andis a statistic.6.Florida voters Florida has played a key role in recent presidential elections. Voter registration records show that 41% ofFlorida voters are registered as Democrats. To test a random digit dialing device, you use it to call 250 randomly chosenresidential telephones in Florida. Of the registered voters contacted,33% are registered Democrats.7.Unlisted numbers A telemarketing firm in Los Angeles uses a device that dials residential telephone numbers in that cityat random. Of the first 100 numbers dialed, 48% are unlisted. This is not surprising because 52% of all Los Angelesresidential phones are unlisted.Correct Answeris a statistic and p 0.52 is a parameter.8.How tall? A random sample of female college students has a mean height of 64.5 inches, which is greater than the 63-

inch mean height of all adult American women.9.pg 419Doing homework A school newspaper article claims that 60% of the students at a large high school did all theirassigned homework last week. Some skeptical AP Statistics students want to investigate whether this claim is true, sothey choose an SRS of 100 students from the school to interview. What values of the sample proportionTo findout, we used Fathom software to simulate choosing 250 SRSs of size n 100 students from a population in which p 0.60. The figure below is a dotplot of the sample proportion ôop of students who did all their homework. (a) Is this the sampling distribution of ôop? Justify your answer. (b) Describe the distribution. Are there any obvious outliers? (c) Suppose that 45 of the 100 students in the actual sample say that they did all their homework last week.What would you conclude about the newspaper article’s claim? Explain.Correct Answer(a) This is not the exact sampling distribution, because that would require a value of for all possible samples of size 100.However, it is an approximation of the sampling distribution that we created through simulation. (b) The distribution is centered at0.60 and is reasonably symmetric and bell-shaped. Values vary from about 0.47 to 0.74. The values at 0.47, 0.73, and 0.74 areoutliers. (c) If we found that only 45 students said they did all their homework last week, we would be skeptical of thenewspaper’s claim that 60% of students did their homework last week. None of the simulated samples had a proportion this low.10. Tall girls According to the National Center for Health Statistics, the distribution of heights for 16-year-old females ismodeled well by a Normal density curve with mean μ 64 inches and standard deviation σ 2.5 inches. To see if thisdistribution applies at their high school, an AP Statistics class takes an SRS of 20 of the 300 16-year-old females at theschool and measures their heights. What values of the sample mean X would be consistent with the population distributionbeing N(64, 2.5)? To find out, we used Fathom software to simulate choosing 250 SRSs of size n 20 students from apopulation that is N(64, 2.5). The figure below is a dotplot of the sample mean height X of the students in the sample.

(a) Is this the sampling distribution of X ? Justify your answer.(b) Describe the distribution. Are there any obvious outliers?(c) Suppose that the average height of the 20 girls in the class’s actual sample is X 64.7. What would youconclude about the population mean height μ for the 16-year-old females at the school? Explain.11.Doing homework Refer to Exercise 9. (a) Make a graph of the population distribution given that there are 3000 students in the school.(Hint: What type of variable is being measured?) (b) Sketch a possible graph of the distribution of sample data for the SRS of size 100 taken by the AP Statisticsstudents.Correct Answer(a)(b) Answers will vary. An example bar graph is given.

12.Tall girls Refer to Exercise 10. (a) Make a graph of the population distribution.(b) Sketch a possible graph of the distribution of sample data for the SRS of size 20 taken by the AP Statisticsclass.Exercises 13 and 14 refer to the following setting. During the winter months, outside temperatures at the Starneses’ cabin inColorado can stay well below freezing (32 F, or 0 C) for weeks at a time. To prevent the pipes from freezing, Mrs. Starnes sets thethermostat at 50 F. The manufacturer claims that the thermostat allows variation in home temperature that follows a Normaldistribution with σ 3 F. To test this claim, Mrs. Starnes programs her digital thermometer to take an SRS of n 10 readingsduring a 24-hour period. Suppose the thermostat is working properly and that the actual temperatures in the cabin vary accordingto a Normal distribution with mean μ 50 F and standard deviation σ 3 F.13.Cold cabin? The Fathom screen shot below shows the results of taking 500 SRSs of 10 temperature readings from apopulation distribution that’s N(50, 3) and recording the sample variance (a) Describe the approximate sampling distribution.each time.

(b) Suppose that the variance from an actual sample isthermostat manufacturer’s claim? Explain. 25. What would you conclude about theCorrect Answer(a) The approximate sampling distribution is skewed to the right with a center at9( F)2. The values vary from about 2 to 27.5( F)2. (b) A sample variance of 25 is quite large compared with what we wouldexpect, since only one out of 500 SRSs had a variance that high. It suggests that the manufacturer’s claim is false and that thethermostat actually has more variability than claimed.14.Cold cabin? The Fathom screen shot below shows the results of taking 500 SRSs of 10 temperature readings from apopulation distribution that’s N(50, 3) and recording the sample minimum each time. (a) Describe the approximate sampling distribution.(b) Suppose that the minimum of an actual sample is 40 F. What would you conclude about the thermostatmanufacturer’s claim? Explain.15. Run a mile During World War II, 12,000 ablebodied male undergraduates at the University of Illinois participated inrequired physical training. Each student ran a timed mile. Their times followed the Normal distribution with mean 7.11minutes and standard deviation 0.74 minute. An SRS of 100 of these students has mean time X 7.15 minutes. A secondSRS of size 100 has mean X 6.97 minutes. After many SRSs, the values of the sample mean X follow the Normaldistribution with mean 7.11 minutes and standard deviation 0.074 minute. (a) What is the population? Describe the population distribution.(b) Describe the sampling distribution of X . How is it different from the population distribution?Correct Answer(a) The population is the 12,000 students; the population distribution (Normal with mean 7.11 minutes and standard deviation0.74 minutes) describes the time it takes randomly selected individuals to run a mile. (b) The sampling distribution (Normal withmean of 7.11 minutes and standard deviation of 0.074 minutes) describes the average mile-time for 100 randomly selectedstudents. This is different from the population distribution in that it has a smaller standard deviation and it describes the mean of100 mile-times rather than individual mile-times.

16.Scooping beads A statistics teacher fills a large container with 1000 white and 3000 red beads and then mixes the beadsthoroughly. She then has her students take repeated SRSs of 50 beads from the container. After many SRSs, the values ofthe sample proportion ôop of red beads are approximated well by a Normal distribution with mean 0.75 and standarddeviation 0.06. (a) What is the population? Describe the population distribution. (b) Describe the sampling distribution of ôop. How is it different from the population distribution?17.IRS audits The Internal Revenue Service plans to examine an SRS of individual federal income tax returns from eachstate. One variable of interest is the proportion of returns claiming itemized deductions. The total number of tax returns ineach state varies from over 15 million in California to about 240,000 in Wyoming. (a) Will the sampling variability of the sample proportion change from state to state if an SRS of 2000 taxreturns is selected in each state? Explain your answer.(b) Will the sampling variability of the sample proportion change from state to state if an SRS of 1% of all taxreturns is selected in each state? Explain your answer.Correct Answer(a) Since the smallest number of total tax returns (i.e., the smallest population) is still more than 10 times the sample size, thevariability of the sample proportion will be (approximately) the same for all states. (b) Yes. It will change—the sample taken fromWyoming will be about the same size, but the sample from, for example, California will be considerably larger, and therefore, thevariability of the sample proportion will be smaller.18.Predict the election Just before a presidential election, a national opinion poll increases the size of its weekly randomsample from the usual 1500 people to 4000 people. (a) Does the larger random sample reduce the bias of the poll result? Explain. (b) Does it reduce the variability of the result? Explain.19.pg 427Bias and variability The figure below shows histograms of four sampling distributions of different statistics intended toestimate the same parameter.

(a) Which statistics are unbiased estimators? Justify your answer. (b) Which statistic doesthebest job ofestimating the parameter? Explain.Correct Answer

(a) Graph (c) shows an unbiased estimator because the mean of the distribution is very close to the population parameter. (b)The graph in part (b) shows the statistic that does the best job at estimating the parameter. Although it is biased, the bias is smalland the statistic has very little variability.20. A sample of teens A study of the health of teenagers plans to measure the blood cholesterol levels of an SRS of 13- to16-year-olds. The researchers will report the mean X from their sample as an estimate of the mean cholesterol level μ inthis population. (a) Explain to someone who knows no statistics what it means to say thatXis an unbiased estimator of μ.(b) The sample result X is an unbiased estimator of the population mean μ no matter what size SRS the studychooses. Explain to someone who knows no statistics why a large random sample gives more trustworthyresults than a small random sample.Multiple choice: Select the best answer for Exercises 21 to 24.21.A newspaper poll reported that 73% of respondents liked business tycoon Donald Trump. The number 73% is (a) a population. (b) a parameter. (c) a sample. (d) a statistic. (e) an unbiased estimator.Correct Answerd22.The name for the pattern of values that a statistic takes when we sample repeatedly from the same population is (a) the bias of the statistic. (b) the variability of the statistic. (c) the population distribution. (d) the distribution of sample data. (e) the sampling distribution of the statistic.23.If we take a simple random sample of size n 500 from a population of size 5,000,000, the variability of our estimate willbe (a) much less than the variability for a sample of size n 500 from a population of size 50,000,000. (b) slightly less than the variability for a sample of size n 500 from a population of size 50,000,000. (c) about the same as the variability for a sample of size n 500 from a population of size 50,000,000.

(d) slightly greater than the variability for a sample of size n 500 from a population of size 50,000,000. (e) much greater than the variability for a sample of size n 500 from a population of size 50,000,000.Correct Answerc24.Increasing the sample size of an opinion poll will (a) reduce the bias of the poll result. (b) reduce the variability of the poll result. (c) reduce the effect of nonresponse on the poll. (d) reduce the variability of opinions. (e) all of the above.25.Dem bones (2.2)Osteoporosis is a condition in which the bones become brittle due to loss of minerals. Todiagnose osteoporosis, an elaborate apparatus measures bone mineral density (BMD). BMD is usually reported instandardized form. The standardization is based on a population of healthy young adults. The World Health Organization(WHO) criterion for osteoporosis is a BMD score that is 2.5 standard deviations below the mean for young adults. BMDmeasurements in a population of people similar in age and gender roughly follow a Normal distribution. (a) What percent of healthy young adults have osteoporosis by the WHO criterion?(b) Women aged 70 to 79 are, of course, not young adults. The mean BMD in this age group is about –2 on thestandard scale for young adults. Suppose that the standard deviation is the same as for young adults. Whatpercent of this older population has osteoporosis?Correct Answer(a) This is the same thing as asking what percent of Normal scores are more than 2.5 standard deviations below the mean. Inother words, what is P (z 2.5)? Using Table A, this value is 0.0062. (b) The distribution for the older women, based on thestandard scale for younger women, is Normal with mean 2 and standard deviation 1. So the question is asking for the probabilityof getting a standard score of less than 2.5. This iswomen aged 70–79 have osteoporosis. So, based on this criterion, about 31% of26.Squirrels and their food supply (3.2)Animal species produce more offspring when their supply of food goes up.Some animals appear able to anticipate unusual food abundance. Red squirrels eat seeds from pinecones, a food source thatsometimes has very large crops. Researchers collected data on an index of the abundance of pinecones and the averagenumber of offspring per female over 16 years. 3 Computer output from a least-squares regression on these data and aresidual plot are shown on the next page.

(a) Give the equation for the least-squares regression line. Define any variables you use. (b) Explain what the residual plot tells you about how well the linear model fits the data. (c) Interpret the values of r2 and s in context.SECTION 7.1Exercises

Dec 20, 2018 · 11. Doing homework Refer to Exercise 9. (a) Make a graph of the population distribution given that there are 3000 students in the school. (Hint: What type of variable is being measured?) (b) Sketch a possible graph of the distribution of sample data for the SRS of size 100 taken by the AP Statistics students. 12. Tall girls Refer to Exerc

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