A random sample of n = 30 metal hardness depths has an s2 of .0885 and a bell-shaped and symmetrical histogram. If σ2 denotes the corresponding population variance, test H0: σ2 = .2209 versus Ha: σ2 < .2209 by setting α equal to .05.
Answer to relevant QuestionsIn order for a cylindrical engine part to give an engine long life, the outside diameter of the part must be between the specification limits of 2.95 inches and 3.05 inches. Assuming normality, determine whether 99.73 ...Recall that the cigarette industry requires that models in cigarette ads must appear to be at least 25 years old. Also recall that a sample of 50 people is randomly selected at a shopping mall. Each person in the sample is ...Consumer Reports (January 2005) indicates that profit margins on extended warranties are much greater than on the purchase of most products. 4 In this exercise we consider a major electronics retailer that wishes to increase ...Suppose a sample of 49 paired differences that have been randomly selected from a normally distributed population of paired differences yields a sample mean of d-bar = 5 and a sample standard deviation of sd = 7. a. ...Test H0: p1 – p2 ≥ – .12 versus Ha: p1 – p2 < – .12 by using a p-value and by setting α equal to .10, .05, .01, and .001. How much evidence is there that p2 exceeds p1 by more than .12? Explain.
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