A humor piece in a reputable medical journal notes that people can't tell for sure whether parachutes are safe and effective because there has never been a properly randomized, double-blind, placebo-controlled study of parachute effectiveness in skydiving. Suppose a researcher were designing such a study.
Complete parts 1 and 2 below.
1) What is the factor in this experiment?
A. Jumping with or without a parachute
B. The parachutes
C. How the parachutes are distributed to the skydivers
D. The skydivers
2) What experimental units should be used?
A. Different brands of parachutes B. Airplanes
C. Volunteer skydivers
D. The research team
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