The independent variable in this experiment is D, hours of sleep. This is the variable that the scientist is manipulating to observe its effect on the students' test performance.
A scientist studying test taking sets up an experiment to see how sleep affects a student's success at taking a test. The scientist sets up four groups of students. One group is allowed to sleep 10 hours before taking a test. Another group sleeps for 8 hours, the third group sleeps for 6 hours, and the fourth group sleeps for 4 hours.
The students all take the same test at the same time in the morning in the same room. The scientist counts how many questions each student gets right and wrong.
What is the independent variable?
Responses
A, duration of test
B, number of correct answers
C, time when test starts
D, hours of sleep
1 answer
0 answers