Some researchers claim that herbal supplements such as ginseng or ginkgo biloba affect human memory. To test this claim, a researcher selects a sample of n = 36 college students. Each student is given a ginkgo biloba supplement daily for six weeks and then all the participants are given a standardized memory test and had a mean score of M = 67. For the population, scores on the test are normally distributed with μ = 70 and σ = 12.
Some researchers claim that herbal supplements such as ginseng or ginkgo biloba affect human memory. To test this claim, a researcher selects a sample of n = 36 college students. Each student is given a ginkgo biloba supplement daily for six weeks and then all the participants are given a standardized memory test and had a mean score of M = 67. For the population, scores on the test are
a. State H0 and H1
b. Evaluate the statistic. Use a two-tailed test with α = .05. (show all work including critical values)
c. Compute Cohen’s d for this study.
d. Write your results in APA research results format.
e. What error might you be making in the decision above?
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