Assignment: Measuring psychological construct

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Assignment: Measuring psychological construct

Assignment: Measuring psychological construct

27. There is a single best way to measure every psychological construct.
a. True
b. False
28. Face validity is the extent to which a psychological measure appears to measure the construct of interest.
a. True
b. False
29. A Cronbach’s alpha of .90 would indicate good internal consistency.
a. True
b. False
30. A psychological measure is valid to the extent that the scores it produces are consistent over time.
a. True
b. False
31. Psychological constructs can be observed directly by looking or listening.
a. True
b. False
32. What are the two defining features of an experiment?
a. control of extraneous variables; statistical analysis of the results
b. statistical analysis of the results; a comparison of two groups
c. a comparison of two groups; manipulation of an independent variable
d. manipulation of an independent variable; control of extraneous variables
33. Why are confounding variables bad?
a. They provide an alternative explanation for any observed difference between conditions.
b. They reduce internal validity.
c. They make it difficult to tell if the independent variable was responsible for the effect on the dependent variable.
d. all of the above
34. Why do researchers randomly assign participants to conditions?
a. to control extraneous variables
b. to ensure that they find a strong statistical relationship between the independent variable and the dependent variable
c. to discover whether there is a placebo effect
d. to avoid fatigue effects
35. Imagine that you are a participant in an experiment on the effects of morning exercise on mathematics performance. If this study uses a within-subjects design, which of the following would you do?
a. One day you take a math test after having exercised in the morning; another day you take a math test after not having exercised in the morning.
b. Either you exercise in the morning and then take a math test or you do not exercise in the morning and then take a math test.
c. You eat a healthy breakfast consisting of milk, juice, toast, and eggs.
d. You take a math test and then tell the researcher whether or not you exercised that morning.
36. Imagine an experiment with one independent variable: noise level (quiet vs. noisy). If the researcher is using a between-subjects design and wants to have 20 participants per condition, how many participants will he need all together?
a. 10
b. 20
c. 40
d. 400

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37. What is the main advantage of conducting an experiment using a within-subjects design rather than a between-subjects design?
a. A within-subjects design eliminates the need for pilot testing.
b. A within-subjects design controls more extraneous variables.
c. A within-subjects design does not require manipulation of an independent variable.
d. A within-subjects design prevents carryover effects.
38. A researcher is conducting a study in which the dependent variable is mental concentration. If it is a within-subjects design with lots of different conditions, then which of the following is most likely to be a problem for the researcher?
a. practice effect
b. fatigue effect
c. context effect
d. floor effect
39. Experimenters manipulate independent variables and control extraneous variables.
a. True
b. False
40. In a between-subjects experiment, each participant is tested in only one condition.
a. True
b. False

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