Hard water II The data set from England and Wales also notes for each town whether it was south or north of Derby. Here are some summary statistics and a comparative boxplot for the two regions. a)...

Hard water II The data set from England and Wales also notes for each town whether it was south or north of Derby. Here are some summary statistics and a comparative boxplot for the two regions.

a) What is the overall mean mortality rate for the two regions?

b) Do you see evidence of a difference in mortality rates? Explain.