Chapter 13, Problem 47E

a)

To determine

To find the factors.

Answer to Problem 47E

Jumping with or without parachute.

Explanation of Solution

The factor is like variable whose levels can be manipulated by the experiment. Therefore, the factor in this study is Jumping with or without parachute.

b)

To determine

To find the experimental units.

Answer to Problem 47E

Volunteer skydivers

Explanation of Solution

In this study, the experimental unit is volunteer skydivers.

c)

To determine

To find the placebo.

Explanation of Solution

In this study, the placebo is parachute that looks real but doesn’t work.

d)

To determine

To find the treatments.

Answer to Problem 47E

A good-working parachute and a placebo parachute.

Explanation of Solution

In this study, the treatments are good-working parachute and a placebo parachute.

e)

To determine

To find the response variable.

Answer to Problem 47E

Survival of parachutist or extent of injuries.

Explanation of Solution

In this study, the response variable survival of parachutist or extent of injuries.

f)

To determine

To find the source of variability that would be control.

Explanation of Solution

In this study, variability would produce by landing surfaces and jump height. Therefore, all jumpers should jump from the same height during the same type of weather conditions on the same type of landing surface. In this way, variability can be control.

g)

To determine

To explain randomization.

Explanation of Solution

The role of randomization is to assign the people randomly to the parachutes. The random assignment should be done to good working parachutes and placebo parachutes.

h)

To determine

To explain whether the double-blind experiment is possible.

Explanation of Solution

The volunteer skydivers should not be aware which volunteers get a good-working parachute or a placebo parachute. The people who evaluate the volunteers after the jump should also be unaware which volunteers received which type of parachute. In this way, double blind experiment can be done.