The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Chapter Seven: The Basics of Experimentation II: Final Considerations, Unanticipated Influences, and Cross-Cultural Issues Chapter Seven: The Basics of Experimentation II: Final Considerations, Unanticipated Influences, and Cross-Cultural Issues

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Participants Types of Participants Three guidelines to help you choose participants for your research project: Precedent Availability Nature of the Problem

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Types of Participants Precedent An established pattern If your literature review indicated that a particular type of participant has been used successfully in prior research projects in your area of interest, you may want to consider using this type of participant.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Types of Participants Availability Availability refers to using an easily accessible population from which to draw participants.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Types of Participants Type of Research Project Often the type of research project will determine the type of participant you decide to use.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Number of Participants Once you have decided what type of participant to use in your research project, you must then determine how many participants you are going to test. In making this decision, there are numerous factors that you must take into account: Finances Time Availability

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Number of Participants Finances How much will it cost to test each participant? Animals need to be purchased and cared for. It may be necessary to pay humans for their participation. Does the person who actually conducts the experiment need to be paid?

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Number of Participants Time As you test additional participants, time requirements will increase, especially if you test participants individually.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Number of Participants Availability The sheer number of participants that are available may influence how many you choose in your experiment.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Number of Participants Availability The sheer number of participants that are available may influence how many you choose in your experiment. The less within-group variability (i.e., the more homogeneous the participants), the fewer participants you will need. The greater the within-group variability (i.e., the more heterogeneous the participants), the greater the number of participants you will need.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Number of Participants Power The number of participants tested is related to the power of your statistical test. Power is the probability that a statistical test will be significant (i.e., the experimental hypothesis is accepted when it is true).

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Apparatus IV presentation Often the nature of the IV will influence the type of apparatus one chooses to use.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Apparatus IV presentation DV recording How the DV will be recorded: Use of a prepared data sheet in a naturalistic observation study. Use of video recording equipment when its presence will not cause reactivity effects.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education The Experimenter as an Extraneous Variable Experimenter Characteristics

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Experimenter Characteristics Physiological Characteristics such as age, sex, and race can have an influence on participants’ responses.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Experimenter Characteristics Physiological Characteristics such as age, sex, and race can have an influence on participants’ responses. Psychological Characteristics such as hostility, anxiety, introversion, or extraversion can also have an influence on participants’ responses.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Experimenter Expectancies Experimenter expectancies are expectations that cause the experimenter to behave toward participants in such a manner that the expected response is more likely shown.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Experimenter Expectancies Rosenthal Effect The experimenter’s preconceived idea of appropriate responding influences the treatment of participants and their behavior. The results of experimenter expectations are often called Rosenthal effects because Rosenthal and his colleagues were among the first to systematically study them.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Controlling Experimenter Effects Physiological and Psychological Effects At present the most common procedures for controlling general experimenter characteristics are to:

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Controlling Experimenter Effects Physiological and Psychological Effects At present the most common procedures for controlling general experimenter characteristics are to: Use standardized methods

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Controlling Experimenter Effects Physiological and Psychological Effects At present the most common procedures for controlling general experimenter characteristics are to: Use standardized methods Use careful training to a set standard when the experimenter administers procedures

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Controlling Experimenter Effects Physiological and Psychological Effects At present the most common procedures for controlling general experimenter characteristics are to: Use standardized methods Use careful training to a set standard when the experimenter administers procedures Standardize appearance, attitude, and so forth as much as possible

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Controlling Experimenter Effects Physiological and Psychological Effects If findings are replicated with a different experimenter, then experimenter effects are less likely to be a factor. A thorough literature review will help make you aware of any relevant experimenter variables in your area of research interest.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Controlling Experimenter Effects Experimenter Expectancies The instructions that the experimenter gives to the participants should be carefully prepared so their manner of presentation will not influence the participants’ responses. Any instructions concerning scoring the participants’ responses should be as objective and concrete as possible and established before the experiment is started.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Controlling Experimenter Effects Experimenter Expectancies Instrumentation and Automation Tape-recorded experimenter instructions to participants Printed instructions Computer displays

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Controlling Experimenter Effects Experimenter Expectancies Instrumentation and Automation Tape-recorded experimenter instructions to participants Printed instructions Computer displays Automated equipment can ensure the accurate recording and storage of response data.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Controlling Experimenter Effects Single-blind Experiment The experimenter has no knowledge regarding which participants receive which treatment(s).

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Participant Perceptions as Extraneous Variables Demand Characteristics Features of the experiment that inadvertently lead participants to respond in a particular manner. Participants in psychological research may attempt to figure out how they are supposed to respond and then behave in this manner.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Participant Perceptions as Extraneous Variables Demand Characteristics Good Participant Effect The tendency of participants to behave as they perceive the experimenter wants them to behave.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Participant Perceptions as Extraneous Variables Response Bias

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Participant Perceptions as Extraneous Variables Response Bias Yea-sayers Participants who tend to answer yes to all questions.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Participant Perceptions as Extraneous Variables Response Bias Yea-sayers Participants who tend to answer yes to all questions. Nay-sayers Participants who tend to answer no to all questions.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Participant Perceptions as Extraneous Variables Response Set The experimental context or testing situation influences the participants’ responses.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Controlling Participant Effects Demand Characteristics

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Controlling Participant Effects Demand Characteristics We can conduct an experiment in which both the experimenter and the participants are unaware of which treatment is being administered to which participants.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Controlling Participant Effects Demand Characteristics We can conduct an experiment in which both the experimenter and the participants are unaware of which treatment is being administered to which participants. Such experiments are known as double-blind experiments.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Controlling Participant Effects Yea-saying The most typical control for yea-saying (and nay-saying) is to rewrite some of the items so that a negative response represents agreement (control for yea-saying) or a positive response represents disagreement (control for nay-saying).

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Controlling Participant Effects Response Set The best safeguard against response set is to review all questions that are asked or items to be completed to see if a socially desired response is implied in any manner.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Controlling Participant Effects Response Set The best safeguard against response set is to review all questions that are asked or items to be completed to see if a socially desired response is implied in any manner. The answer given or response made should reflect the participant’s own feelings, attitudes, or motives rather than an attempt to appear intelligent or well-adjusted or otherwise “normal.”

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education The Interface Between Research and Culture Culture Lasting values, attitudes, and behaviors that are shared by a group and transmitted to subsequent generations.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education The Interface Between Research and Culture Cross-Cultural Psychology A branch of psychology whose goal is to determine the universality of research results.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education The Interface Between Research and Culture Culture, Knowledge, and Truth Etic A finding that is the same in different cultures. Represents an absolute truth.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education The Interface Between Research and Culture Culture, Knowledge, and Truth Etic A finding that is the same in different cultures. Represents an absolute truth. Emic A culture-specific finding Represents a truth relative to a specific culture.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education The Interface Between Research and Culture Ethnocentric Other cultures are viewed as an extension of one’s own culture.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education The Interface Between Research and Culture Ethnocentricity Other cultures are viewed as an extension of one’s own culture. If other cultures are viewed as an extension of one’s own, the result may be research findings that cannot be generalized beyond one’s own culture.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education The Effect of Culture on Research Choice of the Research Problem In some cases there may be no doubt that the choice of your research problem is culture dependent. For example, studying the nature of a crowd at a rock concert.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education The Effect of Culture on Research Choice of the Research Problem Nature of the Experimental Hypothesis

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education The Effect of Culture on Research Choice of the Research Problem Nature of the Experimental Hypothesis Cultural differences may lead to different experimental hypotheses. For example, studies of personal space.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education The Effect of Culture on Research Choice of the Research Problem Nature of the Experimental Hypothesis Selection of the IV and the DV For example, IV presentation and DV measurement may be accomplished by computer in technologically advanced cultures but not in cultures unfamiliar with computers.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Methodology and Analysis Issues Participants and Sampling Procedures The basic question here is whether the sample of participants is representative of the culture from which they were drawn.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Methodology and Analysis Issues Participants and Sampling Procedures The basic question here is whether the sample of participants is representative of the culture from which they were drawn. For example, extreme differences may exist between samples drawn from large urban centers and those drawn from rural areas.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Methodology and Analysis Issues Participants and Sampling Procedures Type of Survey or Questionnaire Used Although an existing survey or questionnaire may work in a few instances, most likely the researcher will not be able to use it for research in a different culture.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Methodology and Analysis Issues Participants and Sampling Procedures Type of Survey or Questionnaire Used Cultural Response Set A cultural response set is the tendency of a particular culture to respond in a certain manner.

The Psychologist as Detective, 4e by Smith/Davis © 2007 Pearson Education Methodology and Analysis Issues Participants and Sampling Procedures Type of Survey or Questionnaire Used Cultural Response Set A cultural response set is the tendency of a particular culture to respond in a certain manner. If differences exist among the groups tested in various cultures, a cultural response set may be operating.