Question

A sociologist wants to know about the stress levels in the nation over the past years. In the late 2000s, the average score on the Brown's Stress Inventory (BSI) in the nation was 18 with a variance of 38.44. A current day sample of 31 produces a mean BSI score of 13.3. What can the sociologist concludes with an α of 0.05?

a) What is the appropriate test statistic?

b) Population:    Sample:

c) Compute the appropriate test statistic(s) to make a decision about H0. (Hint: Make sure to write down the null and alternative hypotheses to help solve the problem.)

critical value =

test statistic =

Decision: FAIL OR REJECT?

d) If appropriate, compute the CI. If not appropriate, input "na" for both spaces below. [ , ]

e)Compute the corresponding effect size(s) and indicate magnitude(s). If not appropriate, input and select "na" below. d = ;   r2 = ;  

f) Make an interpretation based on the results.

There has been a significant increase in depression over the years.

There has been a significant decrease in depression over the years.

There has been no significant change in depression over the years.

Answer 1