# Math 221 Quiz Answers - PRACTICE QUIZ ANSWERS MC 1 MULTIPLE...

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PRACTICE QUIZ ANSWERS MC 1. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Solve the problem: A random sample of 56 fluorescent light bulbs has a mean life of 645 hours with a standard deviation of 31 hours. Construct a 95% confidence interval for the population mean. Points: (712.0, 768.0) (636.9, 653.1) CORRECT ANSWER (539.6, 551.2) (112.0, 118.9) MC 2. MULTIPLE CHOICE In a recent study of 42 eighth graders, the mean number of hours per week that they watched television was 19.6 with a standard deviation of 5.8 hours. Find the 98% confidence interval for the population mean. Points: (18.3, 20.9) (19.1, 20.4) (17.5, 21.7) CORRECT ANSWER (14.1, 23.2) SA 3. SHORT ANSWER. The Marketing analyst of a major e-commerce site claims that the mean time for someone to checkout an item is at most 5 minutes. Write the null and alternative hypotheses. Points: MC 4. MULTIPLE CHOICE Choose the one alternative that best completes the statement or answers the question: The mean age of bus drivers in Chicago is greater than 51.3 years. If a hypothesis test is

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