A flight instructor notices a particularly unusual phenomenon. Every time one of her students has a particularly excellent flight, she praises them for it. And she notices that the next time the student flies, he or she ends up doing worse. On the other hand, every time one of her students has a particularly poor flight, she criticizes them, and the next time they do better. What phenomenon might the instructor be seeing?
a. Regression to the mean
b. Maturation
c. Selection
d. Attrition
Question 2
In comparison to the single-group before-after design, the comparison-group before-after design
a. is less likely to be threatened by regression to the mean.
b. is more likely to be threatened by maturation.
c. helps control for threats caused by history.
d. requires fewer participants.
Running time on 100-meter sprint for men and women master athletes increases with age. Source: Korho
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High school students shopping at the mall