Answered: he Iowa Department of Transportation…

Name: The Iowa Department of Transportation repaired hundreds of bridges in
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Description: The Iowa Department of Transportation repaired hundreds of bridges in 1993. To check the average cost to repair a bridge, a random sample of n = 55 bridges was chosen. The mean and standard deviation for the sample are $25,788 and $1,540, respectivel

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The Iowa Department of Transportation repaired hundreds of bridges in 1993. To check the average cost to repair a bridge, a random sample of n = 55 bridges was chosen. The mean and standard deviation for the sample are $25,788 and $1,540, respectively. Records from previous years indicate an average bridge repair cost was $25,003. Use the sample data to test that the 1993 mean μυ is greater than $25,003. Use α = 0.05.

The hypothesis to be tested is:
H0: mu=25003 vs. Ha: mu not equal to 25003
The test statistic is z=3.78

Please state the correct decision?

	A.	Reject the null hypothesis.
	B.	Accept the null hypothesis.
	C.	Not enough information is given.
	D.	Fail to reject the null hypothesis.

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