Researchers conducted a 'natural experiment' to examine the effects of on-site food services on weight gain among first-year college students living in dormitories. they found that on-site food services produced greater weight gain. in this experiment, the on-site food services is the variable, and the weight gain is the variable.

On-site food services is the INDEPENDENT variable and the weight gain is the DEPENDENT variable

Explanation:

Variables can be dependent or independent. An independent variable is the one used by the researcher to test its degree of influence on the dependent variable. The dependent variable, as the name implies, relies on changes in the independent variable to effect its own changes.

In the question, it is obvious that weight gain among the first year students is dependent on on-site food services

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