Although there is popular belief that herbal remedies such as ginkgo biloba as well as ginseng might enhance 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 the 90 days, each person takes a 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 participants had average of m=84.
A. In sentence, determine the null hypothesis being tested.
B. Using symbols, determine the null hypothesis and the alternative hypothesis.
C. Conduct the hypothesis test using a two-tailed test with a a=.05