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Some researchers claim that herbal supplements such as ginseng or ginkgo biloba enhance human memory. To...

  1. Some researchers claim that herbal supplements such as ginseng or ginkgo biloba enhance human memory. To test this claim, a researcher selects a sample of n = 28 college students. Each student is given a ginkgo biloba supplement daily for 6 weeks and then all of the participants are given a standardized memory test. Scores on the standardized test are μ = 80 and standard deviation of 15. The sample of 28 students had a mean score of M = 85.
    1. Do the data indicate a significant effect of the herb on memory? Use a two-tailed test with α = 0.05. (Show all steps.)
    2. Compute Cohen's d to measure the size of the effect IF it exists.
    3. Write a sentence describing the outcome of the hypothesis test as it would appear in a research report.
Math   Statistics-And-Probability   
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