Survey of female supermarket shoppers

Use this diagram to explain the use of slicing — dynamically selecting only individuals whose values for one variable are within a fairly narrow range.

Drag the red band on the jittered dot plot of Income to select 'slices' of people with similar incomes. This can be used to show the relationship between Purchases and Age of relatively poor people and rich people. Mention that

A supermarket conducts a survey of customers to help identify the characteristics that it should target in its advertising. The jittered dot plot on the right below shows the annual incomes of 100 female shoppers. The scatterplot on the left shows the weekly purchases of groceries and age of the respondents earning between $40,000 and $60,000 per year.