Why is it important to come prepared for a question-and-answer period?

Research is intended to search for data indications rather than to attempt to find causality

Fill in the blank(s) with the appropriate word(s).

Given the following set of scores, what is the mean?

10, 17, 20, 17, 18, 15, 16, 18, 17 a. 16.44 b. 17.5 c. 17 d. 15