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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, ; and for University

Z, . 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.