Chapter 6.2, Problem 6.34E

(a)

To determine

To discuss the design of the experiment and find out the response variable we examine.

Answer to Problem 6.34E

The response variable is the number of accidents.

Explanation of Solution

1000 cars should be randomly selected.500 cars will be given running lights without telling their owners, while the other 500 cars will not get running lights. The cars will be tracked and at the end of a designated period, it can be determined whether there is a difference in the number of accidents when using running lights versus without. The response variable is the number of accidents.

(b)

To determine

To identify the cautions we draw from that example that apply to an experiment on the effects of running lights.

Explanation of Solution

At the time of this experiment, the proportion of cars with runner lights will be relatively low, thus likely making them seem more useful. However, as the years go by and more cars get runner lights, their relative usefulness will go down, since the number of accidents they will prevent will relatively be fewer because more people will have these lights.