As the quality control expert,you want to determine the mean thickness of optical lenses produced by your firm. A sample of 120 lenses reveals the mean of .52 millimeter (mm). The population standard deviation is unknown and the sample standard deviation is .17 millimeter (mm). You feel you can risk a probability of error of only 1 percent.
A) Construct the appropriate confidence interval.
B) Interpret the result in two ways.
C) Graph the problem and solution.