Homework Help: Psychology/Statistics

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.
Psychology/Statistics - PsyDAG, Tuesday, March 9, 2010 at 11:14am
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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