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MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Determine whether the alternative hypothesis is left-tailed, right-tailed, or two-tailed. μ = 11 μ > 11 1) _______ A) left-tailed B) right-tailed C) two-tailed 2) Determine whether the outcome is a Type I error, a Type II error, or a correct decision. A test is made of μ = 7 versus μ ≠7. The true value of μ is 5 and is rejected. 2) _______ A) Type I error B) Type II error C) Correct decision 3) Determine whether the outcome is a Type I error, a Type II error, or a correct decision. A test is made of μ = 18 versus μ ≠18. The true value of μ is 18 and is not rejected. 3) _______ A) Correct decision B) Type I error C) Type II error 4) A new organic pest control formula is being tested on potato plants to see whether it can reduce the level of potato beetle infestation. The mean number of beetles per untreated plant is 5. It is hoped that the new formula may reduce this infestation rate. State the appropriate null and alternate hypotheses. 4) _______ A) μ < 5> 5 B) μ = 5, μ ≠5 C) μ = 5, μ < 5 xss=removed> 258 B) μ = 260, μ > 260 C) μ = 260, μ ≠260 D) μ > 258, μ = 258 6) A sample of 75 chewable vitamin tablets have a sample mean of 251 milligrams of vitamin C. Nutritionists want to perform a hypothesis test to determine how strong the evidence is that the mean mass of vitamin C per tablet differs from 256 milligrams. State the appropriate null and alternate hypotheses. 6) _______ A) μ = 251, μ ≠251 B) μ ≠251, μ = 251 C) μ ≠256, μ = 256 D) μ = 256, μ ≠256 7) A grocery store owner claims that the mean amount spent per checkout is more than $75. A test is made of μ = 75 versus μ > 75. The null hypothesis is rejected. State the appropriate conclusion. 7) _______ A) The mean checkout amount is greater than $75. B) There is not enough evidence to conclude that the mean checkout price is less than or equal to $75. C) There is not enough evidence to conclude that the mean checkout price is greater than . D) The mean checkout amount is less than or equal to $75. 8) A garden supplier claims that its new variety of giant tomato produces fruit with an mean weight of 45 ounces. A test is made of μ = 45 versus μ ≠45. The null hypothesis is rejected. State the appropriate conclusion. 8) _______ A) The mean weight is equal to 45 ounces. B) There is not enough evidence to conclude that the mean weight differs from 45 ounces. C) The mean weight is not equal to 45 ounces. D) There is not enough evidence to conclude that the mean weight is 45 ounces.
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