Constructing Scatterplots

Question 3 • Pre-Algebra B

Which describes a correct way to construct a scatterplot?

Answer

When analyzing the number of junk e-mails received each day of the week, the number of junk e-mails is the independent variable.

When analyzing the number of cups of hot tea that are sold during days with varying average temperatures, temperature is the dependent variable.

When analyzing shoe size according to height, shoe size is the independent variable.

When analyzing the number of boys who participate in volleyball each year for several years, the number of boys who participate in volleyball is the dependent variable.

Explanation

The independent variable is the factor that is varied or used to predict an outcome, and the dependent variable is the result being measured. In choice D, the year is the independent variable, and the number of boys participating in volleyball depends on the year, so it is the dependent variable. The other choices reverse the likely independent and dependent variables.

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