How is a field experiment similar to a lab experiment? Both involve
a. random selection.
b. high internal validity.
c. manipulation of an independent variable.
d. control of extraneous variables.
Answer: C
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Particularly difficult for older adults is combining a _______ task with a ______ task
creative; motor artistic; cognitive creative; artistic motor; cognitive
Which of the following is correct about interpreting the results of statistical tests?
A. Obtaining a probability value of .05 tells us the difference between groups is definitely not caused by chance fluctuation. B. If a probability value falls above .05, then the results will have to be replicated before we can have confidence in them. C. Obtaining a probability value of .05 gives us confidence that the findings are not the result of chance, but does not eliminate this possibility. D. A .05 probability value means there is a 5 percent chance the finding reflects a real difference.