Is the mean height for all adult American males between the ages of 18 and 21 now over 6 feet? If the population of all adult American males between the ages of 18 and 21 has mean height of μ feet and standard deviation σ feet, which of the following null and alternative hypotheses would one test to answer this question?

A) H ₀ : μ = 6 versus H _a : μ = 6 ± m

B) H ₀ : μ ≤ 6 versus H _a : μ > 6

C) H ₀ : μ ≥ 6 versus H _a : μ < 6

D) H ₀ : μ = 6 versus H _a : μ ≠ 6

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