A study investigated the drop in cholesterol levels when subjects took a new drug to subjects who took a placebo. Researchers wanted to test whether there was a difference in the mean decrease in cholesterol for the drug versus that of the placebo. Which of the following gives the appropriate null and alternative hypotheses for this study? (Let 1 stand for the treatment and 2 for the placebo.) Ho: 1 = 2 versus Ha: ₁ 2 1 = μ2 versus Ha: 1 > 2 O Ho: ₁ μ2 versus H₁ : µ₁ = µ2 Ho: 1 = 2 versus Ha: 1 > 2 OHo:

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