## The Dodge Reports are used by many companies in the construction field to estimate the time required to complete various jobs

The Dodge Reports are used by many companies in the construction field to estimate the time required to complete various jobs. The company managers want to know if the time required to install 130 square feet of bathroom tile is different from the nine hours reported in the current manual. A researcher for Dodge randomly selects 54 construction workers and determines the time required to install 130 square feet of bath tile. The average time required to install the tile for the sample is 8.1 hours with a standard deviation of 3.8 hours. Use a hypothesis test to determine whether the managers’ assumptions are substantiated by the data. Use a significance level of α=0.01

. Assume the population of tile installation times is approximately normally distributed.

State the null and alternative hypotheses for the test. Fill in the blank below.

H0Ha: μ=9: μblank9

b. Compute the value of the test statistic. Round your answer to three decimal places.

c. Draw a conclusion and interpret the decision.