In a trial for the university athletics competition, we aim to do inference on the chest size of all male athletes. For a random sample of 70 athletes, the average chest size is 42 inches with a standard deviation of 16 inches.What would be the degree of freedom for the test statistic needed for this inference purpose? A.  69   B. 41    C. 15   D. None of the above.   If the athletics team director claims from his previous experience that the average chest size for the male athletes is less than 45 inches. What should be the corresponding null and alternative hypotheses? A. H0 : μ > 45 vs Ha : μ ≤ 45   B. H0 : μ ≤ 45 vs Ha : μ > 45   C. H0 : μ ≥ 45 vs Ha : μ < 45   D. H0 : μ < 45 vs Ha : μ ≥ 45   What would be the computed test statistic to test the above pair of hypotheses?   A. 1.57   B. -1.57   C.  2.63   D. -2.81

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