A manufacturer of chisels is interested in determining how the angle at which the cutting edge is sharpened affects tool abrasion. To answer this question, engineers obtain 20 similar chisels. They sharpen five chisels at each of 22.5, 25, 27.5, and 30 degrees. Then, they measure the amount of abrasion (rated on a scale of 1 to 10, with 10 being the worst) after cutting several mortises (square holes) in 3/4-inch hard maple boards. Which of the following is the explanatory variable in the given study?

A manufacturer of chisels is interested in determining how the angle at which the cutting edge is sharpened affects tool abrasion. To answer this question, engineers obtain 20 similar chisels. They sharpen five chisels at each of 22.5, 25, 27.5, and 30 degrees. Then, they measure the amount of abrasion (rated on a scale of 1 to 10, with 10 being the worst) after cutting several mortises (square holes) in 3/4-inch hard maple boards. Which of the following is the explanatory variable in the given study?

A manufacturer of chisels is interested in determining how the angle at which the cutting edge is sharpened affects tool abrasion. To answer this question, engineers obtain 20 similar chisels. They sharpen five chisels at each of 22.5, 25, 27.5, and 30 degrees. Then, they measure the amount of abrasion (rated on a scale of 1 to 10, with 10 being the worst) after cutting several mortises (square holes) in 3/4-inch hard maple boards. Which of the following is the explanatory variable in the given study?



(A) Mortises
(B) Tool abrasion
(C) Angle of cutting edge
(D) Sharpening of chisels


Answer: (C) Angle of cutting edge


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