Joey wants to see how the amount of TV watching affects grades. He surveys 100 high school students about the number of hours they watch TV during the week and also their grades. He makes sure that all the students he surveys are freshmen and go to the same class.
a. controlled variables, dependent variables, independent variables
: amount of TV watching
b. controlled variables, dependent variables, independent variables
: grades
c. controlled variables, dependent variables, independent variables
: students who are freshmen and go to the same class
a. controlled variable: students who are freshmen and go to the same class
independent variable: amount of TV watching
dependent variable: grades
b. controlled variables: students who are freshmen and go to the same class, amount of TV watching
dependent variable: grades
c. controlled variables: amount of TV watching, grades
independent variable: students who are freshmen and go to the same class
a. Controlled variable: Students who are freshmen and go to the same class
Dependent variable: Grades
Independent variable: Amount of TV watching
b. Controlled variables: Students who are freshmen and go to the same class
Dependent variable: Grades
Independent variable: Amount of TV watching
c. Controlled variable: Amount of TV watching
Dependent variable: Grades
Independent variable: Students who are freshmen and go to the same class