There is popular belief that herbal remedies such as Ginkgo Biloba and Ginseng may improve learning and memory in healthy adults. In a new study, a researcher obtains a sample of n = 36 participants and has each person take the herbal supplements every day for 90 days. The researcher wants to assess whether memory scores will increase for those taking the herbal remedies. At the end of 90 days, each person takes a standardized memory test. For the general population, scores from the test are normally distributed with a mean of = 80 and a standard deviation of _x = 18. The sample of research participants had an average of 84.

a. Identify the independent variable.

b. Identify the dependent variable.

c. In a sentence, state the null hypothesis.

d. Using symbols, state the null hypothesis.

e. Using symbols, state the alternative hypothesis.

f. Conduct the hypothesis test using a two- tailed test with alpha = .05.

g. What is your conclusion regarding the null hypothesis? Should you reject or fail to reject the null hypothesis?

h. What can you conclude about herbal remedies and memory based on your hypothesis test results?