4. A researcher believes that alcohol intoxication might severely impair driving ability. To test this, she subjects 10 volunteers to a driving simulation test, first when sober, and then, after drinking amounts sufficient to raise their blood alcohol to .04. The researcher measures performance as the number of simulated obstacles with which the driver collides. Thus, the higher the number, the poorer the driving. The data is in the Excel file in the tab labeled Question 4. Test whether there are differences before and after drinking. Conduct a t-test: Two-Sample for Means.
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