Astudent formulated a hypothesis that cotton will grow larger bolls (pods) if magnesium is added to the soil. the student has two experimental fields of cotton, one with magnesium and one without. which data should be collected to support this hypothesis?

The comparison of the size between groups.

Explanation:

This is like a quasi experimental design, where you need to compare the two groups after you apply the stimulus to the experimental group.

To do this comparison you need to collect the size measurement data, that's when you're gonna support your hypothesis or not. Why size data between groups? Simply because your hypothesis is about larger growing cotton bolls, and that refers to size.

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