Calorie intake in UN countries
Use this diagram to illustrate the sample-to-sample variability in graphical displays of data and that the larger the sample size, the less variable the display.
Mention that this variability affects how accurately the sample provides information about the population.
The data set gives calorie intake (Calories/capita/day) in the period 2003-5. (These were the only 176 countries for which information was available on the UN Food and Agriculture Organisation web site.)
It should be noted that the displayed distributions do not take account of the different population sizes.