The threat to internal validity called statistical regression involves the fact that
a. people's scores on repeated tests are not likely to be identical on each testing.
b. changes in the nature of the testing situation lead to different scores.
c. scores in time series designs tend to rise over time.
d. the random error that produces low or high scores in initial testing is not likely to recur on later testing.
d
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Stage 2 of sleep is indicated by sleep spindles and:
a. Alpha bundles b. Slow wave bundles c. K complexes d. Theta spikes
Although being happy depends a great deal on one's overall
life satisfaction, Diener and associates also believe that which of the following is very important? a. one's age and health status b. status and overall accomplishments as judged by one's peers c. one's daytoday emotional experiences d. one's overall relationship with family and friends