Question: Hard water by region Recall from Chapter 7, Exercise 75, that data were collected on the annual mortality rate (deaths per 100,000) for males in

Hard water by region Recall from Chapter 7, Exercise 75, that data were collected on the annual mortality rate (deaths per 100,000) for males in 61 large towns in England and Wales. In addition, the water hardness was recorded as the calcium concentration (parts per million, ppm) in the drinking water. The data set also notes, for each town, whether it was south or north of Derby. Is there a significant difference in mortality rates in the two regions? Here are the summary statistics. (Data in Hard Water)

a) Test appropriate hypotheses and state your conclusion.

b) The boxplots of the two distributions show an outlier among the data in the North region. What effect might that have had on your test?

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