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Is Friday the 13th Unlucky? Use the following data collected on the number of hospitals admissions resulting from motor vehicle crashes, and results are given below for Fridays on the 6th of a month and Fridays on the following 13th of the same month. Use a 0.05 signicance level to test the claim that when the 13th day of a month falls on Friday, the numbers of hospital admissions from motor vehicle crashes are not aected. (Assume population dierences are normally distributed.)

Friday the 6th 9 6 11 11 3 5
Friday the 13th 13 12 14 10 4 12

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