Mr. Knowledge conduct a study to see if his yoga sessions are effective in reducing stress among the participants. He administers a stress scale at pretest and posttest to an experimental group and a control group and then conducts a paired t-test for each group. For the experimental group (i.e., the session participants), the results are statistically significant, with a lower (better) mean stress score at post-test. For the control group, however, the lower mean at posttest is not statistically significant change, and his control group's mean improvement did not reach the critical region. Dr. Knowledge concludes that his sessions were effective in lower participants' stress levels. Do you agree with Mr. Knowledge conclusion? Why or why not?

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