Randy wants to see whether Intervention A is more effective than Intervention B in improving self-esteem scores. Randy conducts an experiment to see if recipients of Intervention A improve more in self-esteem from pretest to posttest than recipients of Intervention B, using the .05 level of significance. Randy conducts two paired-sample t-Tests and finds a p value of .04 for Intervention A's
improvement and a p value of .06 for Intervention B's improvement. Randy then conducts an independent-samples t-Test of the posttest scores and finds a p value of .55 . Which of the following statements is an appropriate conclusion from Randy's findings?
a. Intervention A is more effective than Intervention B in improving self-esteem scores.
b. Both interventions are effective in improving self-esteem scores, but Intervention A is more effective.
c. Both interventions are equally effective in improving self-esteem scores.
d. We cannot conclude that either intervention is effective in improving self-esteem scores.
D
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