Question

• so what im thinking is that we can measure the depedent variable s

by how long it takes to run a fixed disance from 100 meters...so if we
shoes or the old shoes by running 100 meters!

• what would you keep constant?

Explanation:

In an experiment comparing running times with different shoes (new vs old), to ensure a fair test, factors like the runner (same person to keep fitness/ability constant), running surface (e.g., same track), weather conditions (same day/time to avoid wind/temp changes), and the 100 - meter distance (fixed as per the plan) should be constant. These controlled variables eliminate confounding factors so that any difference in time can be attributed to the shoes.

Answer:

Factors to keep constant include: the runner (same individual to maintain consistent physical ability), the running surface (e.g., same track or road), the weather conditions (run at the same time/day to avoid wind/temperature variations), and the distance (strictly 100 meters for each trial).