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 = 25 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.For the population,scores on the test are normally distributed with μ = 70 and σ = 15.The sample of n = 25 students had a mean score of M = 75.
a.Are the data sufficient to say that the herb has a significant effect on memory? Use a two-tailed test with α = .05.
b.Compute Cohen's d for this study.

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The Answer of 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 = 25 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.For the population,scores on the test are normally distributed with μ = 70 and σ = 15.The sample of n = 25 students had a mean score of M = 75.
a.Are the data sufficient to say that the herb has a significant effect on memory? Use a two-tailed test with α = .05.
b.Compute Cohen's d for this study.

Some Researchers Claim That Herbal Supplements Such as Ginseng or Ginkgo