A hydraulic press is operating correctly when the standard deviation of the pressure is at most 120 pounds-per-square-inch (psi). Suppose you take a random sample of 15 measurements throughout the day of the psi and find the standard deviation to be 148. Suppose you want to test whether the press is operating correctly. What are the appropriate null and alternative hypotheses? Select one: O a. Ho : o"< 120² and Hị : o² > 120? O b. Ho : o² > 120² and H : o² < 120² O. Ho : o² – 120² and H¡ : o² > 120² O d. Ho : o? -1202 and Hị : o² # 120?

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