## 6.12 Exercises

### 6.12.1 Exercise

Make a histogram, Q-Q plot, and a box-plot for the life expectancy for a continent of your choice, but for all years. Do the data appear normally distributed?

### 6.12.2 Exercise

1. Select any 2 years in any continent and perform a t-test to determine whether mean life expectancy is significantly different. Remember to plot your data first.

2. Extract only the p-value from your t.test() output.

### 6.12.3 Exercise

In 2007, in which continents did mean life expectancy differ from 70?

### 6.12.4 Exercise

1. Use ANOVA to determine if the population changed significantly through the 1990s/2000s in individual continents.