11. show your work in calculating Z and testing the hypothesis

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 = 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.

For the population, scores on the test are normally distributed with = 70 and = 15. The sample of n = 36 students had a mean score of M = 75.

a. What is the value of Z you calculate?

(2 point)

b. What is the value of Z from the table for a two tailed test at .05?

(2 point)

c. Are the data sufficient to that the herb has a significant effect on memory using a two-tailed test with = .05. say why yes or no.

(2 point)

d. Compute Cohens d for this study.

(2 point)

Please show work and explain, completely lost on this