Question

Question
Dr. Whistle was interested in evaluating whether her therapy for post-traumatic stress disorder (PTSD) was effective for treating a group of trauma (abuse) survivors. Thirty-eight trauma survivors received three weeks of therapy and then completed a PTSD scale. Dr. Whistle’s research hypothesis is that the mean PTSD score for those receiving the therapy will be less than for the general population of trauma survivors (μ = 65, σ = 8). Use null hypothesis testing (all steps) to answer Dr. Whistle’s research question. Be sure to appropriately interpret the confidence interval and effect size (even if it is subjective) and include a general summary of the results. Use α = .01. Show excel formula used.

Data File:

ID	PTSD
1	60
2	56
3	73
4	52
5	57
6	57
7	49
8	68
9	49
10	70
11	55
12	60
13	77
14	60
15	50
16	56
17	62
18	78
19	51
20	49
21	67
22	50
23	63
24	52
25	61
26	57
27	51
28	59
29	69
30	60
31	61
32	69
33	63
34	60
35	50
36	48
37	51
38	67

Answer 1