Question

"Opening up" is thought to improve individuals' mood following a tragic incident. A health psychologist decided to confirm this theory on PTSD patients. The psychologist collected a sample of 19 PTSD patients and asked them to talk about their PTSD related issues ("open up") with their family. The psychologist assessed the patients' level of happiness afterwards and obtained a mean of 106.23 with a variance of 16.08. The average happiness of PTSD individuals is known to be 111. What can be concluded with α = 0.01?

a) What is the appropriate test statistic?
---Select---naz-testOne-Sample t-testIndependent-Samples t-testRelated-Samples t-test

b)
Population:
---Select---familyindividuals' moodPTSD related issuesPTSD individualsPTSD patients
Sample:
---Select---familyindividuals' moodPTSD related issuesPTSD individualsPTSD patients

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: ---Select---Reject H0Fail to reject H0

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/or select "na" below.
d =_______ ; ---Select---natrivial effectsmall effectmedium effectlarge effect
r² =________ ; ---Select---natrivial effectsmall effectmedium effectlarge effect

f) Make an interpretation based on the results.

PTSD patients that "opened up" had a significantly better mood than PTSD individuals.

PTSD patients that "opened up" had a significantly worse mood than PTSD individuals.  

   PTSD patients that "opened up" did not have a significantly different mood than PTSD individuals.

Answer 1