Full answer: In Exercises 920, assume that the paired sample data are simple random
Chapter 9, Problem 15(choose chapter or problem)
In Exercises 920, assume that the paired sample data are simple random samples and that the differences have a distribution that is approximately normal. Is Friday the 13th Unlucky? Researchers collected data on the numbers of hospital admissions resulting from motor vehicle crashes, and resultsare given below for Fridays on the 6th of a month and Fridays on the following 13th of the same month (based on data from Is Friday the 13th Bad forYour Health? by Scanlon, et al., British Medical Journal, Vol. 307, as listed in the Data and Story Line online resource of data sets). Construct a 95%confidence interval estimate of the mean of the population of differences between hospital admissions on days that are Friday the 6th of a month anddays that are Friday the 13th of a month. Use the confidence interval to test the claim that when the 13th day of a month falls on a Friday, the numbersof hospital admissions from motor vehicle crashes are not affected.Friday the 6th 9 6 11 11 3 5Friday the 13th 13 12 14 10 4 12
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