Data Analysis and Displays — Test

Question 15 • Mathematics 8

Which describes a correct way to construct a scatterplot?

Answer

When analyzing the number of students that ride the school bus each day of the week, the day is the dependent variable.

When analyzing the number of registered voters by age, age is the dependent variable.

When analyzing the number of home runs that a baseball player hit over several seasons, the season is the independent variable.

When analyzing the number of umbrellas that are sold during days with varying amounts of rain, the number of umbrellas that are sold is the independent variable.

Explanation

In a scatterplot, the independent variable is the one that is used to explain or predict changes in the dependent variable, and it usually goes on the horizontal axis. The season is the input being compared, while the number of home runs hit can change from season to season. So the season is the independent variable, making choice C correct.

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