Posted by **Charles** on Monday, March 8, 2010 at 4:30pm.

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.

- Psychology/Statistics -
**PsyDAG**, Tuesday, March 9, 2010 at 11:13am
Data for the other two universities are not given. Test for the difference between means.

Z = (mean1 - mean2)/(standard error of difference between means)

SE diff. = sq.rt. (SE1^2 + SE2^2)

SE = standard deviation/sq.rt. (n-1)

SD = sq. rt. of variance

I'll leave the explanation up to you. From my experience in teaching, once you can explain the process to someone else, you will really understand it yourself. Good luck.

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