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**preview**has**blurred**sections. Sign up to view the full version! View Full DocumentPRACTICE 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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