For the independent t test, the null hypothesis states that the samples
a. represent a single population
b. represent different populations
c. are of infinite size
d. each have mean scores of zero
a
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What happens to physical activity through the twenties and thirties across developed countries?
a. Because of starting families, young adults are more physically active because they are likely playing with their children. b. Due to starting careers, physical activity increases tremendously. c. Physical activity continuously drops. d. Since most jobs require considerable physical activity, young adults engage in increasingly more physical activity.
To increase construct validity, an experimenter should
a) Decrease external validity and decrease the number of experimental stimuli. b) Increase external validity and increase the number of experimental stimuli. c) Decrease variability in experimental procedure and decrease the number of experimenters. d) Increase power of the experiment and decrease the internal validity.