# Chapter 2: Quantitative, Qualitative, And Mixed Research .

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Johnson & ChristensenEducational Research, 4eHere is Table 2.1 for your convenience and review.2

Johnson & ChristensenEducational Research, 4eQuantitative Research Methods:Experimental and Nonexperimental ResearchThe basic building blocks of quantitative research are variables.Variables (something that takes on different values or categories) are theopposite of constants (something that cannot vary, such as a single valueor category of a variable).Many of the important types of variables used in quantitative researchare shown, with examples, in Table 2.2.Here is that table for your review:In looking at the table note that when we speak of measurement, themost simple classification is between categorical and quantitative3

Johnson & ChristensenEducational Research, 4evariables. As you can see, quantitative variables vary in degree or amount(e.g., annual income) and categorical variables vary in type or kind (e.g.,gender).The other set of variables in the table (under the heading role taken bythe variable) are the kinds of variables we talk about when explaininghow the world operates and when we design a quantitative researchstudy.As you can see, independent variables (symbolized by "IV") are thepresumed cause of another variable. Dependent variables (symbolized by"DV") are the presumed effect or outcome. Dependent variables areinfluenced by one or more independent variables. What is the IV and DVin the relationship between smoking and lung cancer? (Smoking is the IVand lung cancer is the DV.) Whenever you want to make a claim aboutcause and effect (i.e., that changes in one IV cause changes in anotherIV) you have to be very careful about what are called extraneous variables(i.e., variables that compete with the independent variable in explainingthe outcome). Perhaps the DV did not change because of the IV, but itchanged because of an extraneous variable! You will learn how to“control for” these kinds of variables in several places in your book(including below when we briefly discuss experimental research).Sometimes we want to understand the process or variables throughwhich one variable affects another variable. This brings us to the idea ofintervening variables (also called mediator or mediating variables).Intervening variables are variables that occur between two othervariables. For example, tissue damage is an intervening variable in thesmoking and lung cancer relationship. We can use arrows (which meancauses or affects) and draw the relationship that includes an interveningvariable like this:Smoking Tissue Damage Lung CancerSometimes a relationship does not generalize to everyone; therefore,researchers often use moderator variables to show how the relationshipchanges across the levels of an additional variable. For example, perhapsbehavioral therapy works better for males and cognitive therapy worksbetter for females. In this case, gender is the moderator variable. Therelationship be type of therapy (behavioral versus cognitive) andpsychological relief is moderated by gender.Now, I will talk about the major types of quantitative research:experimental and nonexperimental research.4

Johnson & ChristensenEducational Research, 4eExperimental ResearchThe purpose of experimental research is to study cause and effectrelationships.Its defining characteristic is active manipulation of an independentvariable (i.e., it is only in experimental research that “manipulation” ispresent). Also, random assignment (which creates "equivalent" groups) isused in the strongest experimental research designs.Here is an example of an re: E stands for the experimental group (e.g., new teaching approach) C stands for the control or comparison group (e.g., the old orstandard teaching approach) 1 and 2 subscripts stand for time: 1 time one; 2 time two.Because the best way to make the two groups similar in the aboveresearch design is to randomly assign the participants to theexperimental and control groups, let’s assume that we have aconvenience sample of 50 people and that we randomly assign them tothe two groups in our experiment.Here is the logic of this experiment. First, we made our groupsapproximately the same at the start of the study by using randomassignment (i.e., the groups are “equated”). You pretest the participantsto see how much they know. Next, you manipulate the independentvariable by using the new teaching approach with the experimentalgroup and using the old teaching approach for the control group. Now(after the manipulation) you measure the participants’ knowledge to seehow much they know after having participated in our experiment. Let’ssay that the people in the experimental group show more knowledgeimprovement than those in the control group. What would you conclude?In this case, we can conclude that there is a causal relationship betweenthe IV, teaching method, and the DV, knowledge, and specifically we canconclude that the new teaching approach is better than the old teachingapproach. Make sense?5

Johnson & ChristensenEducational Research, 4eNow, let’s say that in the above experiment we could not use randomassignment to equate our groups. Let’s say that, instead, we had our bestteacher (Mrs. Smith) use the new teaching approach with her students inher 5th period class and we had a newer and less experienced teacher(Mr. Turner) use the old teaching approach with his 5th period class. Let’sagain say that the experimental group did better than the control group.Do you see any problems with claiming that the reason for the differencebetween the two groups is because of the teaching method? The problemis that there are alternative explanations. First, perhaps the difference isbecause Mrs. Smith is the better teacher. Second, perhaps Mrs. Smithhad the smarter students (remember the students were not randomlyassignment to the two groups; instead, we used two intact classrooms).We have a name for the problems just mentioned. It is the problem ofalternative explanations. In particular, it is very possible that thedifference we saw between the two groups was due to variables otherthan the IV. In particular, the difference might have been due to theteacher (Mrs. Smith vs. Mr. Turner) or to the IQ levels of the groups(perhaps Mrs. Smith’s students had higher IQs than Mr. Smith’sstudents) We have a special name for these kinds of variables. They arecalled extraneous variable.It is important to remember the definition of an extraneous variablebecause extraneous variables can destroy the integrity of a researchstudy that claims to show a cause and effect relationship. An extraneousvariable is a variable that may compete with the independent variable inexplaining the outcome. Remember this, if you are ever interested inidentifying cause and effect relationships you must always determinewhether there are any extraneous variables you need to worry about. Ifan extraneous variable really is the reason for an outcome (rather thanthe IV) then we sometimes like to call it a confounding variable because ithas confused or confounded the relationship we are interested in.Nonexperimental ResearchRemember that the defining characteristic of experimental research wasmanipulation of the IV. Well, in nonexperimental research there is nomanipulation of the independent variable. There also is no randomassignment of participants to groups.What this means is that if you ever see a relationship between twovariables in nonexperimental research you cannot jump to a conclusionof cause and effect because there will be too many other alternativeexplanations for the relationship.6

Johnson & ChristensenEducational Research, 4eIn the chapter, we make a distinction between two examples ofnonexperimental research. In the "basic case" of causal-comparativeresearch, there is one categorical IV and one quantitative DV. Example: Gender (IV) and class performance (DV). You would look for the relationship by comparing the male andfemale average performance levels.In the simple case of correlational research, there is one quantitative IVand one quantitative DV. Example: Self-esteem (IV) and class performance (DV). You would look for the relationship by calculating the correlationcoefficient. The correlation coefficient is a number that varies between –1 and 1, and 0 stands for no relationship. The farther the number isfrom 0, the stronger the relationship. If the sign of the correlation coefficient is positive (e.g., .65) thenyou have a positive correlation, which means the two variablesmove in the same direction (as one variable increases, so does theother variable). Education level and annual income are positivelycorrelated (i.e., the higher the education, the higher the annualincome). If the sign of the correlation coefficient is negative (e.g., -.71) thenyou have a negative correlation, which means the two variablesmove in opposite directions (as one variable increases, the otherdecreases). Smoking and life expectancy are negatively correlated(i.e., the higher the smoking, the lower the life expectancy).7

Johnson & ChristensenEducational Research, 4eWe will show you how to improve on the two basic nonexperimentaldesigns in later chapters, but for now, please remember these importantpoints:1) You can obtain much stronger evidence for causality fromexperimental research than from nonexperimental research (e.g., astrong experiment is better than causal-comparative and correlationresearch).8

Johnson & ChristensenEducational Research, 4e2) You cannot conclude that a relationship is causal when you only haveone IV and one DV in nonexperimental research (without controls).Therefore, the basic cases of both causal-comparative and correlationresearch are severely flawed!3) In later chapters we explain three necessary conditions for causality(relationship, temporal order, and lack of alternative explanations)For a brief preview of these three required conditions required tomake a firm statement of cause and effect, read this next section. Itis provided as supplemental or preview material for this topic whichoccurs in many chapters of the book. If you have had enough fornow, just skip to the next section of this lecture entitled QualitativeResearch Methods.There are three required conditions that you must establish wheneveryou want to conclude that a relationship is causal. They are shown in thefollowing Table from a later chapter in your textbook:Our experiment met these criteria quite nicely. That is, we had arelationship between teaching method and knowledge; the manipulationoccurred before the posttest; and because we randomly assigned thepeople to the two groups, there should be no other variables that canexplain away the relationship.On the other hand, in the basic cases of causal-comparative andcorrelational research, where we only observed a relationship betweentwo variables (we had no manipulation or random assignment), we haveonly established condition 1. We can only conclude that the two variablesare related. In chapter 13 we will show you how to designnonexperimental research that performs better than the basic cases onthe three above conditions.9

Johnson & ChristensenEducational Research, 4eStill, remember, even when these basic cases are improved, experimentalresearch with random assignment is better for studying cause and effectthan nonexperimental research. Another way of saying this is, if youwant to show that one thing causes another thing, then, if it is feasible,you will want to CONDUCT AN EXPERIMENT.Qualitative Research MethodsWe described the major characteristics of qualitative research earlier, inTable 2.1. There are five major types of qualitative research:phenomenology, ethnography, case study research, grounded theory,and historical research. All of the approaches are similar in that they arequalitative approaches. Each approach, however, has some distinctcharacteristics and tends to have its own roots and following.Here are the definitions and an example of the different types ofqualitative research: Phenomenology – a form of qualitative research in which theresearcher attempts to understand how one or more individualsexperience a phenomenon. For example, you might interview 20widows and ask them to describe their experiences of the deathsof their husbands. Ethnography – is the form of qualitative research that focuses ondescribing the culture of a group of people. Note that a culture isthe shared attitudes, values, norms, practices, language, andmaterial things of a group of people. For an example of anethnography you might decide to go and live in a Mohawkcommunities and study the culture and their educationalpractices. Case study research – is a form of qualitative research that isfocused on providing a detailed account of one or more cases. Foran example, you might study a classroom that was given a newcurriculum for technology use. Grounded theory – is a qualitative approach to generating anddeveloping a theory from data that the researcher collects. For anexample, you might collect data from parents who have pulledtheir children out of public schools and develop a theory to explainhow and why this phenomenon occurs, ultimately developing atheory of school pull-out.10

Johnson & Christensen Educational Research, 4eSome researchers like to conduct mixed research in a singlestudy, and this is what is truly called mixed research. However, itis interesting to note that many if not most research literatures aremixed at the aggregate level, even if no single researcher usesmixed research. That's because there will usually be somequantitative and some qualitative research studies in a researchliterature.Our Research TypologyWe have now covered the essentials of the three research methodologyparadigms and their subtypes. Let’s put it all together in the followingpicture of our research typology:12

qualitative data. (Note that pure qualitative research will follow all of the paradigm characteristics of qualitative research shown in the right column of Table 2.1.) Mixed research – research that involves the mixing of quantitative and qualitative methods or paradigm characteristics. The mixing of

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