The Iowa Department of Transportation repaired hundreds of bridges in 1993. To check the average cost to repair a bridge

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The Iowa Department Of Transportation Repaired Hundreds Of Bridges In 1993 To Check The Average Cost To Repair A Bridge 1 (20.58 KiB) Viewed 37 times

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 U is greater than $25,003. Use a- 0.05. The hypothesis to be tested is: HO: mu-25003 vs. Ha: mu not equal to 25003 The test statistic is z-3.78 Please state the correct decision? OA, Fail to reject the null hypothesis. OB. Accept the null hypothesis. OC. Reject the null hypothesis. OD. Not enough information is given.