Question 28For the following z-test statistic, compute the p-value assuming that thehypothesis test is a one-tailed test: z
= -1.55.

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Chap 9 Graded HW: OIS 2340-090 Summer 2015 Business Statistics
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0.0172
0.0901
0.1512
0.0606
Correct!
2.63 / 2.63 ptsQuestion 29For the following z-test statistic, compute the p-value assuming that thehypothesis test is a one-tailed test: z
Correct!
2.63 / 2.63 ptsQuestion 30The manager of an online shop wants to determine whether the mean lengthof calling time of its customers is significantly more than 3 minutes. Arandom sample of 100 customers was taken. The average length of callingtime in the sample was 3.1 minutes with a standard deviation of 0.5 minutes.At a 0.05 level of significance, it can be concluded that the mean of thepopulation is:

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Chap 9 Graded HW: OIS 2340-090 Summer 2015 Business Statistics
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not significantly greater than 3.
not significantly different from 3.10.
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Question 31The power of a test is measured by its capability of:
Correct!
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Question 32If thepvalue is less than α in a two-tailed test,a one-tailed test should be used.
the null hypothesis should not be rejected.You Answeredthe null hypothesis should be rejected.Correct AnswerMore information is needed to reach a conclusion about thenull hypothesis.

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Chap 9 Graded HW: OIS 2340-090 Summer 2015 Business Statistics
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Question 33Which of the following statements is true?
2.63 / 2.63 ptsQuestion 34The makers of Mini-Oats Cereal have an automated packaging machine thatcan be set at any targeted fill level between 12 and 32 ounces. Every box ofcereal is not expected to contain exactly the targeted weight, but the averageof all boxes filled should. At the end of every shift (eight hours), 16 boxes areselected at random and the mean and standard deviation of the sample arecomputed. Based on these sample results, the production control managerdetermines whether the filling machine needs to be readjusted or whether itremains all right to operate. Useα=0.05. Establish the appropriate null andalternative hypotheses to be tested for boxes that are supposed to have anaverage of 24 ounces.

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