Is Friday the 13th Unlucky? Researchers collected data on the numbers of hospital admissions resulting from motor

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Is Friday the 13th Unlucky? Researchers collected data on the numbers of hospital 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 (based on data from €œIs Friday the 13th Bad for Your 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 and days 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 numbers of hospital admissions from motor vehicle crashes are not affected.

Assume that the paired sample data are simple random samples and that the differences have a distribution that is approximately normal.

Distribution
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Question Posted: May 03, 2015 09:08 AM

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Is Friday the 13th Unlucky? Researchers collected data on the numbers of hospital admissions resulting from motor

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