Refer to the IHS Journal of Hydraulic Engineering (September 2012) study of commercial pipes used in a

Question:

Refer to the IHS Journal of Hydraulic Engineering (September 2012) study of commercial pipes used in a water network, Exercise 2.124. Of interest was the ratio of repair to replacement cost of the pipe. The ratios for a sample of 13 different pipe sizes are listed in the next table. Assume these data represent a random sample selected

from all possible types of commercial pipe. A Minitab analysis of the data follows.

a. Locate a 95% confidence interval for the mean ratio of repair to replacement cost for all commercial pipe on the accompanying Minitab printout.
b. A civil engineer claims that the average ratio of repair to replacement cost could be as low as 7.0. Do you agree? Explain.
c. What assumptions about the data are required for the interval, part a, to be valid?

Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...