Question: A psychotherapist studied whether his clients self-disclosed more while sitting in an easy chair or lying down on a couch. All clients had previously agreed to allow the sessions to be videotaped for research purposes. The therapist randomly assigned 10 clients to each condition. The third session for each client was videotaped and an independent observer counted the clients' disclosures. The therapist reported that clients made more disclosures when sitting in easy chairs (M = 18.20) than when lying down on a couch (M = 14.31), 418) = 2.84, p > .01, two-tailed (not significantly different with significance level = 1 %). The effect size was medium. Discuss these results, listing the null hypothesis and the research hypothesis, and which is supported. Also discuss how this study could have increased power (refer to material in Chapter 7), including the design of the experiment, i.e. t test for independent vs. dependent means. (The paragraph on p. 259 will be helpful.) Finally, include in the discussion whether you would redo the experiment, whether it would be likely to be significant and whether it would be worth the effort.

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