The herbal supplement biloba ginko is advertised as producing an increase in physical strength and stamina....

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The herbal supplement biloba ginko is advertised as producing anincrease in physical strength and stamina. To test this claim, asample of n = 27 adults is obtained and each person is instructedto take the regular dose of the herb for 45 days. At the end of the45-day period, each person is tested on a standard treadmill taskfor which the average score for the population is Âµ = 18. Theindividuals in the sample produce a mean score of M = 21.2 with SS= 1460.
1.) Are these data sufficient to conclude that the herb has astatistically significant effect on stamina using a two-tailed testwith alpha = .05? Be specific here (in other words, reject orretain the null and why and then interpret what that means). Makesure to show all four (or five) steps.
2.) What decision would be made if the researcher used aone-tail test with alpha = .05 and why? Be specific.

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4.0 Ratings (429 Votes)

x 212 s2 1460 n 27 18 1 H0 18 Herb does not have a statistically significant effect on stamina H1 18 Herb has a statistically significant effect on stamina Test See Answer

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