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 ? =
70 and ? = 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 twotailed
test with ? = .05.
b. compute cohen