Some researchers claim that herbal supplements such as ginseng or ginkgo biloba enhance human memory. To test this claim, a researcher selects a sample of n = 25 college students. Each student is given a ginkgo biloba supplement daily for six weeks and then all the participants are given a standardized memory test. For the population, scores on the test are normally distributed with μ = 70 and σ = 15. The sample of n = 25 students had a mean score of M = 75. Are the data sufficient to say that the herb has a significant effect on memory? Use a two-tailed test with α = .05. State your null hypothesis: and alternative hypothesis a. H0 μ = 70 b. H1 μ ≠ 70 c. Herbal supplements increase memory. d. Herbal supplements decrease memory. Calculate the standard error σ M = and the test statistic (z) = What critical z value will you compare this with? Make a decision on your hypotheses R. reject the null F. fail to reject the null
Some researchers claim that herbal supplements such as ginseng or ginkgo biloba enhance human memory. To test this claim, a researcher selects a sample of n = 25 college students. Each student is given a ginkgo biloba supplement daily for six weeks and then all the participants are given a standardized memory test. For the population, scores on the test are normally distributed with μ = 70 and σ = 15. The sample of n = 25 students had a mean score of M = 75. Are the data sufficient to say that the herb has a significant effect on memory? Use a two-tailed test with α = .05. State your null hypothesis: and alternative hypothesis a. H0 μ = 70 b. H1 μ ≠ 70 c. Herbal supplements increase memory. d. Herbal supplements decrease memory. Calculate the standard error σ M = and the test statistic (z) = What critical z value will you compare this with? Make a decision on your hypotheses R. reject the null F. fail to reject the null
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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Some researchers claim that herbal supplements such as ginseng or ginkgo biloba enhance human memory. To test this claim, a researcher selects a sample of n = 25 college students. Each student is given a ginkgo biloba supplement daily for six weeks and then all the participants are given a standardized memory test. For the population, scores on the test are normally distributed with μ = 70 and σ = 15. The sample of n = 25 students had a mean score of M = 75.
Are the data sufficient to say that the herb has a significant effect on memory? Use a two-tailed test with α = .05.
State your null hypothesis:
and alternative hypothesis
a. H0 μ = 70
b. H1 μ ≠ 70
c. Herbal supplements increase memory.
d. Herbal supplements decrease memory.
Calculate the standard error σ M =
and the test statistic (z) =
What critical z value will you compare this with?
Make a decision on your hypotheses
R. reject the null
F. fail to reject the null
Compute Cohen's d for this study.
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