Question

Researchers were interested in whether the herbal supplement Ginkgo Biloba (GB) enhances memory. In a pilot study, six middle-aged women took a memory test. The women then took the GB supplement each day for 10 weeks, after which they each took a similar memory test. Subject 1 2 3 4 5 6 Pre-GB Memory 64 77 59 82 71 76 Post-GB Memory 70 85 61 76 75 80 a.) (6 points) Construct a boxplot of the improvements (post – pre) in memory in the sample of subjects. Full credit will be given only if you use the method described in class, including the method for identification of outliers. b.) (8 points) Construct a 90% confidence interval for the average improvement in memory score after 10 weeks of taking the Ginkgo Biloba supplement. c.) (3 points) Does your confidence interval in (b.) provide strong evidence that the Ginkgo Biloba supplement, on average, improves memory? How can you tell from this interval?

          Researchers were interested in whether the herbal supplement Ginkgo Biloba (GB) enhances memory. In a pilot study, six middle-aged women took a memory test. The women then took the GB supplement each day for 10 weeks, after which they each took a similar memory test.

Subject 1 2 3 4 5 6
Pre-GB Memory 64 77 59 82 71 76
Post-GB Memory 70 85 61 76 75 80

a.) (6 points) Construct a boxplot of the improvements (post – pre) in memory in the sample of subjects. Full credit will be given only if you use the method described in class, including the method for identification of outliers.

b.) (8 points) Construct a 90% confidence interval for the average improvement in memory score after 10 weeks of taking the Ginkgo Biloba supplement.

c.) (3 points) Does your confidence interval in (b.) provide strong evidence that the Ginkgo Biloba supplement, on average, improves memory? How can you tell from this interval?

Added by Jennifer B.

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