Chet plans an experimental investigation to see how well a new fertilizer works on daisies. The fertilizer must be dissolved in water and delivered to the plants by spraying it onto the leaves and stems.To set up his control group for the experiment, Chet should leave out the

A control group is treated the same way as the experimental group except that it does not receive the factor being tested. Since Chet is testing the fertilizer, he should spray the control daisies with water but leave out the fertilizer. The correct choice is fertilizer.

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