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{"ops":[{"insert":"2. A researcher intends to estimate the effect of a drug on the scores of human subjects\nperforming a task of psychomotor coordination. The members of a random sample of 9\nsubjects were given the drug prior to testing. The mean score in this group was 9.78, and\nthe sample variance was 17.64. An independent random sample of 10 subjects was used as\na control group and given a placebo prior to testing. The mean score in this control group\nwas 15.10, and the sample variance was 27.01. Assuming that the population distributions\nare normal with equal variances, find a 90% confidence interval for the difference between\nthe population mean scores.\n"}]}
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