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 µ = 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.
