The pairing of "time spent studying for an exam and the grade on the exam" is most likely to produce a straight line on a scatterplot. This is because, generally, as time spent studying increases, the grade on the exam also tends to increase in a predictable manner, creating a linear relationship between the two variables.
The other pairs may not necessarily exhibit a linear relationship in the same clear way:
- "Time it takes to get to the grocery store and the number of grocery items purchased" could vary greatly depending on factors unrelated to time.
- "Time spent playing video games and adult shoe size" likely has no relevant relationship.
- "Time spent mowing the lawn and the number of snakes in the yard" does not suggest a clear linear relationship either.
So, the best choice is time spent studying for an exam and the grade on the exam.
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