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    Hypothesis Testing: Paired t test

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    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.

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    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.