2.3. Do men and women have similar life expectancies?
12 If a scatterplot of male versus female life expectancies is drawn, there is a strong positive association. The answer to the question would appear to be "Yes, they do," but is this the best graph to draw? The computer package can be used to calculate the difference between female and male life expectancy for each country (females have higher life expectancies in most countries). This new variable of "differences" can be analysed in various ways:
What is the average difference?
What is the minimum difference?
What is the maximum difference?
In which countries do these occur?
What are possible explanations for these differences?
13 Side-by-side boxplots provide an excellent visual display of the data on male and female life expectancies.
2.4. Are birth rates related to death rates?