# Hypothesis Testing: Paired t test

17. A researcher studies the effect of cognitive psychotherapy on positive self-regard. The number of positive statements made about oneself is recorded for each participant during the first meeting. After 8 weekly therapy sessions, the measures are repeated for each person. For the following data.

Participant before treatment after treatment

A 7 10

B 6 13

C 9 12

D 5 8

a. Calculate the difference scores and Md

b. Compute SS, sample variance, and estimated standard error

c. Is there a significant treatment effect? Use ±=.05, two tails.

https://brainmass.com/statistics/hypothesis-testing/hypothesis-testing-paired-t-test-358361

#### Solution Summary

The solution provides step by step method for the calculation of testing of hypothesis. Formula for the calculation and Interpretations of the results are also included.