Posted by **Jerry** on Saturday, July 18, 2009 at 11:58am.

Do students at various colleges differ in how sociable they are? Twenty-Five students were randomly selected from each of three colleges in a particular region and were asked to report on the amount of the time they spent socializing each day with other students. The results for college X was a mean of 5 hours and an estimated population variance of 2 hours: for college Y, M=4, S^2=1.5: and for college z, M =6, S^2=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;

(c) explain your answers to (a) and (b) to someone who has never had a course in statistics.

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