In 2006 the mean weight of men was believed to be 86.8 kg. To test for an increase in the weight a random sample of 100 men showed a mean weight of 88.7 kg with a sample standard deviation of 11.64 kg. The test-statistic calculated is: 88.7-86.8 A. z = B. z= 88.7-86.8 11.64 11.64 100 100 86.8-88.7 88.7-86.8 С. D. z = 1.164 1.164 A. A В. В С. С D. D

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