Answer:
The correct answer is -
The dependent variable - Sleeping time or amount of both test groups.
Step-by-step explanation:
In this experiment where the effect of jazz music on the sleeping pattern of people is being tested. For this study, there are two test groups, a control group with a quiet room and an experiment group with slow jazz music during their sleeping and monitored the time when both groups of people sleep.
So, the independent variable is slow jazz music here which is affecting the sleeping amount of time people sleeping, so the dependent variable is the time people sleep