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Psy 315 Chapter#9 - 17

Psy 315 Chapter#9 - 17

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Chapter 9

17. 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 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, S2 = 1.5; and for College 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 (a) and (b) to someone who has never had a course in

statistics.

A.

Research Hypothesis: Groups of students are not sociable.

Null Hypothesis: All groups of students are sociable.

Groups Count Sum Average Variance

X 25 125 5 2

Y 25 100 4 1.5

Z 25 150 6 2.5

Cutoff for t, 2, 72 at 0.05, two tailed. Below 72 on the graph 2,70, cutoff equals 3.13.

Because the calculated F-statistics is equal to 12.5 which is greater than 3.1239, we reject the

null hypothesis, meaning the groups of students are significantly different socially.

B

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Chapter 9 17. 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 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, S2 = 1.5; and for College 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 ...
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