School-aged children are regularly asked to fundraise for their school. Typically, they are required to sell a minimum amount. This mandate results in most students selling that minimum, with some exceptional children selling far larger quantities. The minimum sales constraint that likely causes positively skewed data is consistent with a effect.

Floor effect.

Step-by-step explanation:

A floor effect is when your subjects have results that are close to the bottom and the minimum sales constraint that likely causes positively skewed data is consistent with a floor effect because requiring students to sell a minimum amount gets them to worry only about selling the minimum amount to fulfill the requirement and they won't be interested in selling more and because of that, the results tend to be close to the bottom.