Mark's parents want him to ride on a fire truck with other kids in the upcoming Independence Day Parade. But Mark just got his driver's license, and he wants to drive his father's Camaro in the parade to impress a girl named Katelyn.

Given this situation, which statement is true?

• a.)
• How Mark participates in the parade is a response variable. Whether or not Katelyn is impressed is an explanatory variable.
• b.)
• How Mark participates in the parade and whether or not Katelyn is impressed are both response variables.
• c.)
• How Mark participates in the parade is an explanatory variable. Whether or not Katelyn is impressed is a response variable.
• d.)
• How Mark participates in the parade and whether or not Katelyn is impressed are both explanatory variables.

For the first time ever, Robert brought home a report card with straight-As. His parents wonder how he improved his grades from previous semesters. Robert says that he has dedicated more time every night to studying than he had previously.

Given this situation, which statement is true?

• a.)
• The amount of time Robert spent studying is the explanatory variable, while his grades are the response variable.
• b.)
• The amount of time Robert spent studying and his grades are both response variables.
• c.)
• The amount of time Robert spent studying is the response variable, while his grades are the explanatory variable.
• d.)
• The amount of time Robert spent studying and his grades are both explanatory variables.

For the first time ever, Robert brought home a report card with straight-As. His parents wonder how he improved his grades from previous semesters. Robert says that he has dedicated more time every night to studying than he had previously.

Given this situation, which statement is true?

• a.)
• The amount of time Robert spent studying is the explanatory variable, while his grades are the response variable.
• b.)
• The amount of time Robert spent studying and his grades are both response variables.
• c.)
• The amount of time Robert spent studying is the response variable, while his grades are the explanatory variable.
• d.)
• The amount of time Robert spent studying and his grades are both explanatory variables.