Although there is a popular belief that herbal remedies such as Ginkgo biloba and Ginseng may improve learning and memory in healthy adults, these effects are usually not supported by well-controlled research. In a typical study, a researcher obtains a sample of n= 16 participants and has each person take the herbal supplements every day for 90 days. At the end of the 90 days, each person takes a standardized memory test. For the general population, scores from the test form a normal distribution with a mean of μ=50 and σ=12. the sample of research participants had an average of M=54. α=.05. Evaluate the effect of the supplements. Answer the following: a. one-tailed or two-tailed test: a. State H0 and HA b. what is the z value for the critical region? b. σM= ? c. z-score or test statistic = ? d. What is your decision?
Although there is a popular belief that herbal remedies such as Ginkgo biloba and Ginseng may improve learning and memory in healthy adults, these effects are usually not supported by well-controlled research. In a typical study, a researcher obtains a sample of n= 16 participants and has each person take the herbal supplements every day for 90 days. At the end of the 90 days, each person takes a standardized memory test. For the general population, scores from the test form a
Answer the following:
a. one-tailed or two-tailed test:
a. State H0 and HA
b. what is the z value for the critical region?
b. σM= ?
c. z-score or test statistic = ?
d. What is your decision?
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