Transport Quebec Repaired Hundreds of Bridges in 1993 $\mu$ Is Greater Than $25,003

Essay

Transport Quebec 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 $1540, respectively. Records from previous years indicate an average bridge repair cost was $25,003. Use the sample data to test that the 1993 mean $\mu$ is greater than $25,003. Use $\alpha$ = 0.05.