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.

Question

a.
: amount of TV watching
b.
: grades
c.
: students who are freshmen and go to the same class

Answer 1

d. Population: high school students
e. Sampling method: convenience sampling
f. Sample size: 100
g. Extraneous variables:
- Time management skills of students
- Study habits of students
- Physical health of students
- Family support and environment
- Prior academic performance of students
- Individual differences in learning abilities and styles