One criticism of a stratified random sample is that ____
a. it is not based on a random selection process
b. the sample may not be representative of the population
c. some segments of the population will not be represented in the sample
d. it often prevents the use of more powerful statistical analyses
b
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Why did Descartes choose the pineal gland as the "seat of the soul"?
A. It was a hollow structure. B. It was attached just below the two cerebral hemispheres. C. It looked like a pump. D. It was the largest visible structure in the brain.
The trichromatic theory explains how:
a. we experience an afterimage b. the brain changes light waves into color c. cones in the retina change light waves into colors d. rods in the retina change light waves into colors
Ernest has collected and examined his research data, and now has a set of general principles that he believes accounts for the acquisition of personality traits. Ernest has formed a(n) __________ of personality.
A. theory B. operational definition C. experimental design D. opinion
When you look at the pattern below, you tend to perceive three "groups" of two items each rather than perceiving six separate items. XX XX XX This tendency is best explained by the Gestalt principle of
A. common fate. B. closure. C. similarity. D. proximity.