What percentage of students taking medications for their ADHD show improvements in academic performance and peer relation?

If I wanted to determine, on average, how far apart any one score is from another, I should use a measure of

A) central tendency. B) correlation. C) variability. D) statistical significance.

The American expectant mother mentioned all of the following ways that she maintains her healthy pregnancy except for which of the following?

a. goes to the gym twice per week b. yoga c. jogging d. eating a healthier diet