To illustrate the effects of driving under the inuence (DUI) of alcohol, a police ofcer brought a

To illustrate the effects of driving under the influence (DUI) of alcohol, a police officer 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.

(a) Whether the student had unimpaired vision or wore goggles first was randomly selected. Why is this a good idea in designing the experiment?
(b) Use a 95% confidence interval to test if there is a difference in braking time with impaired vision and normal vision where the differences are computed as €œimpaired minus normal.€

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Subject Normal, X 4.47 4.24 4.58 4.65 4.31 4.80 4.55 5.00 4.79 Impaired, Y 5.77 5.67 5.51 5.32 5.83 5.49 5.23 5.61 5.63 2 3 4