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Determine the value of test statistic to estimate the population mean.

Assume we wish to test the hypotheses H0: μ = 10 versus Ha: μ < 10, where μ represents the mean age of non-high school aged children who are members of a large gymnastics club in a metropolitan area. Assume age follows a normal distribution with σ = 2.  A random sample of 16 ages is drawn from the population, and we find the sample mean of these observations to be μ = 8.76

What is the value of test statistic?

A) z = -0.62                                        C) z = -2.48

B) z = -1.24                                        D) z = -9.92

Statistics and Probability, Statistics

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