Answer to Question #340985 in Statistics and Probability for marawan

Question

2. A researcher intends to estimate the effect of a drug on the scores of human subjects

performing a task of psychomotor coordination. The members of a random sample of 9

subjects were given the drug prior to testing. The mean score in this group was 9.78, and

the sample variance was 17.64. An independent random sample of 10 subjects was used as

a control group and given a placebo prior to testing. The mean score in this control group

was 15.10, and the sample variance was 27.01. Assuming that the population distributions

are normal with equal variances, find a 90% confidence interval for the difference between

the population mean scores.

Answer 1

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