Suppose we wish to test the hypotheses Ho: u= 10 versus Ha: u<10, where u represents the mean age of children not in high school who are members of a large gymnastics club in a metropolitan area. Assume age follows a Normal distribution with o=2. A random sample of 16 ages is drawn from the population, and we find the sample mean of these observations to be x = 8.76. What is the value of the test statistic? A) z B) z=-1.24 C) z=-2.48 D) z =-9.92 =-0.62

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