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...

Some researchers claim that herbal supplements such as ginseng or ginkgo biloba affect human memory. To test this claim, a researcher selects a sample ofn = 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 withμ = 70 andσ = 12.

a. State H₀ and H₁

b. Evaluate the statistic. Use a two-tailed test withα = .05. (show all work including critical values)

c. Compute Cohen’s d for this study.