Yes, Homer used a control in his experiment. The side of the shower that he sprayed with water serves as the control group, while the side sprayed with coconut juice is the experimental group. By comparing the effects of coconut juice to water, Homer can assess whether coconut juice has any effect on the green slime. Since there was no change in the appearance of the green slime on either side after 3 days, it suggests that neither treatment was effective.
Homer noticed that his shower was covered in a strange green slime. His friend Barney told him that coconut juice will get rid of the slime. Homer decided to check this this out by spraying half of the shower with coconut juice. He sprayed the other half of the shower with water. After 3 days of "treatment" there was no change in the appearance of the green slime on either side of the shower.
Did Homer use a control?
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