A humor piece published in a reputable medical journal notes

A humor piece published 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? a) through? h) below.

Solution

(a). Jumping with or without a parachute

(b). Volunteer skydivers
(c). A parachute that looks real but doesn\'t work
(d). A good parachute and a placebo parachute
(e). Whether the skydiver survives the jump or not (or the extent of their injuries)
(f). Jump height, weather conditions, landing surface
(g). Randomly assign skydivers to parachutes
(h). Skydivers are not told who received a working parachute and the people evaluating the subjects after their jumps are not told what kind of parachute the subject had