Question: Context A high school student named David Merrell did an experiment to examine if music affects the ability of rats to run a maze. The

Context

A high school student named David Merrell did an experiment to examine if music affects the ability of rats to run a maze. The explanatory variable was exposure to music. He had three treatment groups: one grouplistened to heavy metal music by the group Anthrax. Asecond grouplistened to Mozart. Thethird groupnever heard music. This last group is the control group.

The response variable was the average time (in seconds) to complete three runs. Every week the rats ran the maze three times. Merrell recorded each rat's average time for the week.

Direct controls of potential confounding variables:

Merrell trained all of the rats to run the same maze.
He gave all mice the same amount of food and light.
All mice had the same approximate age and weights.
During the treatment phase, the rats were exposed to the treatment for the same amount of time, e.g. rats heard music at 70 decibels for 10 hours a day for a month.

Results:

Question: Context A high school student named David Merrell did an experiment to examine if music affects the ability of rats to run a maze. The

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