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 that the herb has a significant effect on memory? Use a two-tailed test with α = .05. Show all steps in the hypothesis test. b. Compute Cohen’s d for this study. c. Compute the power of the test. Use +5 as the effect size.
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
a. Are the data sufficient to that the herb has a significant effect on memory? Use a two-tailed test with α = .05. Show all steps in the hypothesis test.
b. Compute Cohen’s d for this study.
c. Compute the power of the test. Use +5 as the effect size.
Trending now
This is a popular solution!
Step by step
Solved in 2 steps