A researcher is interested in testing the popular belief that herbal remedies like Ginko Biloba and Ginseng may improve learning and memory. She obtains a sample of 16 participants. She 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 memory test form a normal distribution and they have a mean of 50 and a standard deviation of 12. The sample of the 16 research participants had an average memory score of 54.Using the standard 5-step procedure, conduct a two-tailed hypothesis test with α=.05 to evaluate the effect of the supplements.What is the z-score that corresponds to the boundaries of the critical region?
A researcher is interested in testing the popular belief that herbal remedies like Ginko Biloba and Ginseng may improve learning and memory. She obtains a sample of 16 participants. She 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 memory test form a normal distribution and they have a
Using the standard 5-step procedure, conduct a two-tailed hypothesis test with α=.05 to evaluate the effect of the supplements.
What is the z-score that corresponds to the boundaries of the critical region?
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