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20) A local group claims that the police issue at least 60 speeding tickets a day in their area. To prove their
point, they randomly select two weeks. Their research yields the number of tickets issued for each day. The
data are listed below. At (3 a 0.01, test the groups claim.
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32 60 72 58
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
31) Determine the stxndardizied test statistic, 2., to test the claim about the population proportion p
given n = 60 and p = 0.656. Use it a 0.05.
Al -1.85 B) -4.21 C) -1.96 D} -1.76
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the quwtion.
22) An airline claims that the no-show rate for passengers is less than 5%. In a sample of 420 randomly selected
reservations. 19 were no-.-_al’uns’s. At a = 0.01, test the airline’s claim.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
23) Find the critical X2 -values to test the claim o3 as 6.8 if n 2 I0 and a = 0.01.
A) 2.700, 19.023 8} 3.325. 16.919 C) 1.735, 23.589 D} 2.088. 21.666
SHORT ANSWER. Wnte the word or phrase that best completes each statement or answers the question.
24) The heights (in inches) of 20 randomly selected adult males are listed below. Test the claim that the
variance is less than 6.25. Use a = 0.05. Assume the population is normally distributed.
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67”/’l707469687l.7l 7.172