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Posted: June 28th, 2023
The Iowa Department of Transportation repaired hundreds of
The Iowa Department of Transportation repaired hundreds of bridges in 1993. To check the average cost to repair a bridge, a random sample ofn = 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 meanμυ is greater than $25,003. Useα = 0.05.The hypothesis to be tested is:H0: mu=25003 vs. Ha: mu not equal to 25003The test statistic is z=3.78Please state the correct decision?A.Accept the null hypothesis.B.Fail to reject the null hypothesis.C.Not enough information is given.D.Reject the null hypothesis.
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