An office manager claims that the mean time required to handle a customer complaint is less than 30 minutes. A sample of 38 complaints shows a mean of 28.7 minutes and a variance of 12 minutes. The correct conclusion at 5% significance level is:  A. Reject null hypothesis  B. Accept null hypothesis  C. Reject alternative hypothesis  D. None of the preceding

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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An office manager claims that the mean time required to handle a customer complaint is less than 30 minutes. A sample of 38 complaints shows a mean of 28.7 minutes and a variance of 12 minutes. The correct conclusion at 5% significance level is:  A. Reject null hypothesis  B. Accept null hypothesis  C. Reject alternative hypothesis  D. None of the preceding
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