You have a group of male high school math teachers with high scores on authoritarianism and you want to investigate the influence of authoritarianism on students' attitudes toward math. What kind of a comparison group would you choose to provide the most control in this study?
a. a group of high school teachers with low scores on authoritarianism
b. a group of high school math teachers with low scores on authoritarianism
c. a group of male high school math teachers with low scores on authoritarianism
Question 2
Identify the threats to internal validity illustrated in the examples below. Students falling below the 10th percentile on a reading achievement test later receive higher scores on a similar test; students above the 90th percentile receive lower scores on the second test administration.
a. experimental mortality
b. reactive effect of testing
c. statistical regression
d. maturation
e. instrumentation
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