Although there is popular belief which herbal remedies such as ginkgo biloba and ginseng might improve learning and memory in healthy adults, these effects are usually not supported by well-controlled research. In typical study, a researcher obtains sample of n=36 participants and has each person take herbal supplements everyay for 90 days. At the end of 90 days, each person takes standardized memory test. For the general population, scores from test are normally distributed with mean on m=80 and standard deviation of o=18. The sample research participantshad an average of m=84.
A. In sentence, describe the null hypothesis being tested.
B. Using symbols, describe the null hypothesis and the alternative hypothesis.
C. Develop the hypothesis test using a two-tailed test with a a=.05