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Elementary Statistics | 12th Edition | ISBN: 9780321836960 | Authors: Mario F. Triola
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In Exercises, assume that the paired sample

Chapter 9, Problem 15BSC

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QUESTION:

In Exercises 9–20, 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 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 “Is 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.

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QUESTION:

In Exercises 9–20, 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 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 “Is 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.

ANSWER:

Solution 15BSC

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