Question

(a) Briefly explain what you understand by phrase “homogeneity of the chloride level in a 

water sample from a lake”

(b) Briefly explain how you would have done sampling in this study to obtain a set of 

representative samples.

Answer 1

Apply the t-test at the 95% confidence level to determine if the chloride level from the top of the lake is different from that at the bottom.

Now use the paired t-test and determine whether there is a significant difference between the top and bottom values at the 95% confidence level.