6
QuizMultiple Choice

Constructing Scatterplots — Quiz

Question 6 • Mathematics 8

Which describes a correct way to construct a scatterplot?

Answer
A
When analyzing shoe size according to height, shoe size is the independent variable.
B
When analyzing the number of junk e-mails received each day of the week, the number of junk e-mails is the independent variable.
C
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.
D
When analyzing the number of cups of hot tea that are sold during days with varying average temperatures, temperature is the dependent variable.

Explanation

In a scatterplot, the independent variable is the factor used to predict or explain changes, and the dependent variable is the measured outcome. For participation measured across several years, the year is the independent variable, while the number of boys who participate is the dependent variable. Therefore, choice C correctly identifies the variables.

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