The dilemma facing the experimenter is determining how large a difference between the
sample means is enough to decide that something other than _____ is at work in the
experiment.
a. the independent variable
b. a treatment effect
c. sampling error
d. systematic variation
C
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A test publisher describes a psychological test as having extremely high predictive validity. this means the test
a. has the ability to forecast particular outcomes b. has a high correlation with similar measures c. discriminates well between related concepts d. all of the above
Vinay uses data from his study to estimate that the heritability of athletic ability is .60. This implies that about 60 percent of _________
a. variation in athletic ability is due to genetics. b. variation in athletic ability is due to environment. c. people are athletic. d. people are not athletic.