Question

A school psychologist believes that a popular new hypnosis technique increases depression. The psychologist collects a...

A school psychologist believes that a popular new hypnosis technique increases depression. The psychologist collects a sample of 23 students and gives them the hypnosis once a week for two months. Afterwards the students fill out a depression inventory in which their average score was 49.21. Normal individuals in the population have a depression inventory average of 49 with a variance of 121.00. What can the psychologist conclude with an α of 0.01?

a) What is the appropriate test statistic?
z-test

Independent-Samples t-test

Related-Samples t-test

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 =   ;   ---Select--- na trivial effect small effect medium effect large effect
r2 =   ;   ---Select--- na trivial effect small effect medium effect large effect

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