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To illustrate the effects of driving under the inuence (DUI) of alcohol, a police ofcer brought a DUI simulator to a local high school. Student reaction time in an emergency was measured with unimpaired vision and also while wearing a pair of special goggles to simulate the effects of alcohol on vision. For a random sample of nine teenagers, the time (in seconds) required to bring the vehicle to a stop from a speed of 60 miles per hour was recorded. Complete parts (a) and (b). Note: A normal probability plot and boxplot of the data indicate that the differences are approximately normally distributed with no outliers. a Click the icon to view the data table. (a) Whether the student had unimpaired vision or wore goggles rst was randomly selected. Why is this a good idea in designing the experiment? 0 A. This is a good idea in designing the experiment because reaction times are different. 0 B. This is a good idea in designing the experiment because it controls for any "learning" that may occur in using the simulator. O C. This is a good idea in designing the experiment because the sample size is not large enough. (b) Use a 95% condence interval to test if there is a difference in braking time with impaired vision and normal vision where the differences are computed as "impaired minus normal." The lower bound is The upper bound is . 0 Data Table (Round to the nearest thousandth as needed.) State the appropriate conclusion. Choose the correct answer below. Q There is sufcient evidence to conclude there is a difference in braking time with impaired vi Sublect 1 2 3 4 5 6 7 3 9 Normal, Xi 4.49 4.24 4.58 4.65 4.31 4.80 4.55 5.00 4.79 Impairedl Yi 5.77 5.85 5.51 5.32 5.90 5.49 5.23 5.61 5.63 0 There is insufficient evidence to conclude there is a difference in braking time with impaired