The mean soil iron concentration was determined to be 42 µg/kg with a standard deviation of 16 µg/kg for soil samples taken from a local golf course. Calculate the confidence limits for this sample for each of the following cases - Be sure to show the calculations needed to solve each problem in the space provided on the Part IV worksheet:
a) 95% confidence limits where sample size (n) equals 12.
b) Write a brief "plain language" summary of what your calculations in part "a" means.
b) 95% confidence limits where sample size (n) equals 20.
c) 99% confidence limits where sample size (n) equals 20