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 value of the test statistic (rounded off to three decimals) is:    A. Z=2.313  B. Z=-0.668  C. Z=-2.313  D. T=-0.668

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