Data on the numbers of hospital admissions resulting from motor vehicle crashes
ID: 2908523 • Letter: D
Question
Data on the numbers of hospital admissions resulting from motor vehicle crashes are given below for Fridays on the 6th of a month and Fridays on the following 13th of the same month. Assume that the paired sample data is a simple random sample and that the differences have a distribution that is approximately normal. Construct a? 95% confidence interval estimate of the mean of the population of differences between hospital admissions. 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.
Friday the 6th 12 7 10 9 2
Friday the 13th 13 11 12 14 14
In this? example, ?d is the mean value of the differences d for the population of all pairs of? data, where each individual difference d is defined as the number of hospital admissions on Friday the 6th minus the number of hospital admissions on Friday the 13th. Find the? 95% confidence interval.
___ < ?d < _____
?(Round to two decimal places as? needed.)
Based on the confidence? interval, can one reject 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?
a) Yes, because the confidence interval includes zero.
b) No, because the confidence interval includes zero.
c) Yes, because the confidence interval does not include zero.
d) No, because the confidence interval does not include zero.
Explanation / Answer
solution:-
given that
d = -1,-4,-2,-5,-12
mean d-bar = -4.8
standard deviation = 4.3243
95% confidence with df = 4 is,t = 2.776
confidence interval formula
=> d-bar +/- t* s / sqrt(n)
=> -4.8 +/- 2.776 * 4.3243/sqrt(5)
=> (-10.17 , 0.57)
a) Yes, because the confidence interval includes zero.
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