The standard deviation is an average that is calculated by adding up a set of quantities and dividing the sum by the total number of quantities in the set

How many times more likely is a man to have a personality disorder in Cluster A (paranoid, schizoid, or schizotypal) than a woman?

a. 5 b. 10 c. 15 d. 20

Researchers have found that as autonomic arousal increases from low levels to moderate levels:

a. performance on tasks tends to decrease b. performance on tasks is not affected c. people are more likely to become upset when they make errors d. performance on tasks tends to improve