Question

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. The therapist predicts that cognitive psychotherapy will increase the number of positive statements. For the following data: Before Treatment: 7, 6, 9, 5 After Treatment: 10,12,7,17

Null hypothesis: Cognitive psychotherapy will not increase positive self-regard.

What is the appropriate conclusion from this study?

reject alternative hypothesis

retain alternative hypothesis

reject null hypothesis

fail to reject null hypothesis

Answer 1

Paired sample tTest has been used for testing hypothesis. Following are the steps followed:

Please note here After treatment has been used as Sample 1 and Before treatment has been used as Sample 2.

It is concluded that the null hypothesis Ho is not rejected. Therefore, there is not enough evidence to claim that the population mean μ1​ is greater thanμ2​, at the 0.05 significance level.

The appropriate conclusion from this study: Fail to reject the null hypothesis