(Solved): An industrial plant wants to determine which of two types of fuel (gas or electric) will produce mo ...

An industrial plant wants to determine which of two types of fuel (gas or electric) will produce more useful energy at a lower cost. One measure used is plant investment per delivered quad ($ invested /quadrillion BTUS). The smaller this number, the less an industrial plant pays for delivered energy. Suppose we wish to use a hypothesis test to determine if there is evidence to indicate a difference in the mean investment/quad between plants using electrical utilities (He) and those using gas utilities (ug). Our null and alternative hypotheses would be: Hint: We first cover inference for a difference in means in Section 6.4. Select one: a. Ho: (He - Hg) ?0, Ha: (He - Hg) > 0 b. Ho: (H. - Hg) = 0, H?: (He-Hg) < 0 c. Ho: (H.-Hg) = 0, H?: (He-Hg) = 0 d. Ho: (He-Hg) = 0, Ha: (He-Hg) ? 0