Question

activator ~ 3 min
identify the dependent & independent variables in this experiment:
a student wants to know how sleep affects test scores. they take a survey of the friends in their study group (so time spent studying is the same) asking the length of time spent sleeping and their test score on their last bio exam.
independent variable:
dependent variable:
dependent variable: the variable being measured in the experiment. located on the y axis.
independent variable: the variable controlled in the experiment to get the results. located on the x axis. hint: its often time.

Explanation:

The independent variable is what's controlled (here, sleep duration as it's what's surveyed to see its effect). The dependent variable is what's measured (test scores, as they depend on sleep).

Answer:

Independent variable: length of time spent sleeping
Dependent variable: test score on the last Bio exam