wk7 - 1.

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1. Question: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.   Your Answer:          (712.0, 768.0)              (636.9, 653.1)     CORRECT          (539.6, 551.2)              (112.0, 118.9)       Points Received: 4 of 4     Comments: 2. Question: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.   Your Answer:          (18.3, 20.9)              (19.1, 20.4)              (17.5, 21.7)     CORRECT ANSWER          (14.1, 23.2)     INCORRECT   Points Received: 0 of 4     Comments: 3. Question: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.  
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This note was uploaded on 12/08/2009 for the course STATS STATS430 taught by Professor Forgot during the Spring '08 term at DeVry Chicago.

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wk7 - 1.

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