Question 22

Year is the independent variable.

In the context of the graph, the year serves as the independent variable, which means it is the variable that is manipulated or changed to observe its effect on the dependent variable.

A) Year is the dependent variable.

This statement is incorrect because the dependent variable is influenced by the independent variable. In this case, the year does not rely on another variable for its value; rather, it provides a timeline for the data being presented.

B) Year is the measured variable.

This option is also incorrect. A measured variable is typically the dependent variable, which is observed and recorded in response to changes in the independent variable. Year, in this instance, is not being measured but is instead the basis for measuring other variables.

C) Value is the independent variable.

This statement is incorrect because "value" typically refers to the dependent variable that changes in response to the independent variable, which in this case is the year. Therefore, value cannot function as the independent variable.

D) Year is the independent variable.

This statement is correct, as the year is the variable that is intentionally changed or categorized to observe its impact on other measured data points, making it the independent variable in the context of the graph.

Conclusion

The identification of the year as the independent variable is crucial for understanding the dynamics presented in the graph. All other options fail to recognize this role, mistakenly attributing the characteristics of the independent variable to the dependent or measured variables. Thus, option D is definitively the correct answer.