Validity is whether an instrument measures what it is supposed to measure; reliability is whether an instrument gets consistent results across administrations. If spouses fill out a self-report measure of stress from their spouse's point of view, and the spouses' scores match closely, we can say that the self-report inventory is

By age 17, nearly 80 percent of American girls are unhappy with their bodies

Indicate whether the statement is true or false.

The value of the Pearson r indicates

a. the strength of the linear relationship between two sets of interval measures b. the strength of the non-linear relationship between two sets of interval measures c. the strength of the linear relationship between two sets of nominal measures d. all of these