Question

A health psychologist hypothesizes that depression levels in the nation have been decreasing over the years. In the late 2000s, the average score on the Birk Depression Inventory (BDI) in the nation was 17 with a variance of 56.25. A current sample of 16 generates an average BDI score of 13.4. What can be concluded with an α of 0.10?

a) What is the appropriate test statistic?
na z-test one-sample t-test independent-samples t-test related-samples t-test

b)
Population:
current sample the nation the BDI score the years depression levels
Sample:
current sample the nation the BDI score the years depression levels

c) Obtain/compute the appropriate values 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: Reject H0 or Fail to reject H0

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

Answer 1