17. Do students at various universities differ in how sociable they are? Twenty-five students were randomly selected from each of three universities in a region and were asked to report on the amount of time they spent socializing each day with other students. The result for University X was a mean of 5 hours and an estimated population variance of 2 hours; for University Y, M = 4, S2

= 1.5;

and for University Z, M = 6, S2

= 2.5. What should you conclude? Use the

.05 level.

(a) Use the steps of hypothesis testing,

(b) figure the effect size for the study; and

(c) explain your answers to parts

(a) and

(b) to someone who has never had a course in statistics.