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9. [-/4.08 Points] DETAILS BBUNDERSTAT12 8.4.009.MI.S. MY NOTES ASK YOUR TEACHER In this problem, assume that the distribution of differences is approximately normal. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smaller. In some situations, this choice of d.f. may increase the P-value by a small amount and therefore produce a slightly more "conservative" answer. Are America's top chief executive officers (CEOs) really worth all that money? One way to answer this question is to look at row B, the annual company percentage increase in revenue, versus row A, the CEO's annual percentage salary increase in that same company. Suppose a random sample of companies yielded the following data: B: Percent increase 22 25 25 18 21 37 for company A: Percent increase 21 23 22 14 79 15 30 for CEO USE SALT Do these data indicate that the population mean percentage increase in corporate revenue (row B) is different from the population mean percentage increase in CEO salary? Use a 5% level of significance. (Let d = B - A.) (a) What is the level of significance? State the null and alternate hypotheses. O Hold = 0; H ,: Hd > 0 O Hold = 0 ; H ,:H d = 0 OHoily > 0 ; H , : H d = 0 OHO:My = 0; H ,: 1 d = 0 OHgilly = 0 ; H , : H g 0.500 0.250