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5. It is possible to directly compare the results of a confidence interval estimate to the results obtained by testing a null hypothesis if: a. a two-tailed test is used. b. a one-tailed test is used. c. both of the previous statements are true. d. none of the previous statements is true. 6. Suppose a 95% confidence interval for the proportion of Iraqi people who exercise regularly is 0.29 to 0.37. Which one of the following statements is FALSE? a. The hypothesis that 33% of Iraqi people exercise regularly cannot be rejected. b. It is reasonable to say that more than 40% of Iraqi people exercise regularly. C. It is reasonable to say that more than 25% of Iraqi people exercise regularly d. It is reasonable to say that fewer than 40% Iraqi people exercise regular 7. A statistics professor used X = "number of class days attended" (out of 30) as an independent variable to predict Y = "score received on final exam" for a class of his students. The resulting regression equation was Y = 39.4 +1.43. Which of the following statements is true? a. If attendance increases by 1.4 days, the expected exam score will increase by 1 point b. If attendance increases by 1 day, the expected exam score will increase by 39.4 points c. If attendance increases by 1 day, the expected exam score will increase by 1.4 points d. If the student does not attend at all, the expected exam score is 1.4