1. Although there is a popular belief that herbal remedies such as ginkgo biloba and ginseng may improve learning and memory in health adults, these effects are usually not supported by well-controlled research (Persson, Bringhlov, Nilson, & Nyberg, 2004). In a typical study, a researcher obtains a sample of n = 36 participants and has each person take the herbal supplements every day for 90 days. AT the end of the 90 days, each person takes standardized memory test. For the general population, scores form the test are normally distributed with a mean of u participants had an average of M= 84. = 80 and a standard deviation of o = 18. The sample of research A. Assuming a two-tailed test, state the null hypothesis in a sentence that includes the two variables being examined. B. Using symbols, state the hypothesis ( Ho and H1) for the two-tailed test. C. Calculate the test statistics ( z-score) for the sample. D. What decision should be made about the null hypothesis, and what decision should be made about the effect of the herbal supplements?

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1. Although there is a popular belief that herbal remedies such as ginkgo biloba
and ginseng may improve learning and memory in health adults, these effects
are usually not supported by well-controlled research (Persson, Bringhlov,
Nilson, & Nyberg, 2004). In a typical study, a researcher obtains a sample of n =
36 participants and has each person take the herbal supplements every day for
90 days. AT the end of the 90 days, each person takes standardized memory test.
For the general population, scores form the test are normally distributed with a
mean of u
participants had an average of M= 84.
= 80 and a standard deviation of o = 18. The sample of research
A. Assuming a two-tailed test, state the null hypothesis in a sentence that
includes the two variables being examined.
B. Using symbols, state the hypothesis ( Ho and H1) for the two-tailed test.
C. Calculate the test statistics ( z-score) for the sample.
D. What decision should be made about the null hypothesis, and what decision
should be made about the effect of the herbal supplements?
Transcribed Image Text:1. Although there is a popular belief that herbal remedies such as ginkgo biloba and ginseng may improve learning and memory in health adults, these effects are usually not supported by well-controlled research (Persson, Bringhlov, Nilson, & Nyberg, 2004). In a typical study, a researcher obtains a sample of n = 36 participants and has each person take the herbal supplements every day for 90 days. AT the end of the 90 days, each person takes standardized memory test. For the general population, scores form the test are normally distributed with a mean of u participants had an average of M= 84. = 80 and a standard deviation of o = 18. The sample of research A. Assuming a two-tailed test, state the null hypothesis in a sentence that includes the two variables being examined. B. Using symbols, state the hypothesis ( Ho and H1) for the two-tailed test. C. Calculate the test statistics ( z-score) for the sample. D. What decision should be made about the null hypothesis, and what decision should be made about the effect of the herbal supplements?
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