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 = 37 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 are normally distributed with a mean of μ = 80 and a standard deviation of σ = 20. The sample of research participants had an average of M = 82. Which of the statements below is the best option for the null hypothesis being tested. Answer A, B, or C in the box Option A. The herbal supplements have an increasing effect on memory scores. Option B. The herbal supplements have no effect on memory scores. Option C. The herbal supplements have a decreasing effect on memory scores. Which of the below sets of symbols best states the null hypothesis and the alternative hypothesis. Answer A, B, C, or D in the box Option A. H o: μ = 80; H 1: μ ≠ 80 Option B. H o: μ = 80; H 1: μ > 80 Option C. H o: μ = 80; H 1: μ < 80 Option D. H o: μ = 82; H 1: μ ≠ 82 Conduct the hypothesis test using a two-tailed test with = 0.10. (Use/round to 2 decimal places.) z-critical = ± z = Which of the below sets of options best represents the appropriate conclusion. Answer A, B, C, or D in the box Option A. Reject the null hypothesis, the herbal supplements do not have a significant effect on memory scores. Option B. Reject the null hypothesis, the herbal supplements have a significant effect on memory scores. Option C. Fail to reject the null hypothesis, the herbal supplements have a significant effect on memory scores. Option D. Fail to reject the null hypothesis, the herbal supplements do not have a significant effect on memory scores.
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 = 37
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 are
Which of the statements below is the best option for the null hypothesis being tested. Answer A, B, or C in the box
Option A. The herbal supplements have an increasing effect on memory scores.
Option B. The herbal supplements have no effect on memory scores.
Option C. The herbal supplements have a decreasing effect on memory scores.
Which of the below sets of symbols best states the null hypothesis and the alternative hypothesis. Answer A, B, C, or D in the box
Option A. H o: μ = 80; H 1: μ ≠ 80
Option B. H o: μ = 80; H 1: μ > 80
Option C. H o: μ = 80; H 1: μ < 80
Option D. H o: μ = 82; H 1: μ ≠ 82
Conduct the hypothesis test using a two-tailed test with = 0.10. (Use/round to 2 decimal places.)
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z-critical = ±
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z =
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Which of the below sets of options best represents the appropriate conclusion. Answer A, B, C, or D in the box
Option A. Reject the null hypothesis, the herbal supplements do not have a significant effect on memory scores.
Option B. Reject the null hypothesis, the herbal supplements have a significant effect on memory scores.
Option C. Fail to reject the null hypothesis, the herbal supplements have a significant effect on memory scores.
Option D. Fail to reject the null hypothesis, the herbal supplements do not have a significant effect on memory scores.
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