An insurance underwriter wonders whether sports cars "cause" people to drive too fast or whether those with a propensity for speeding are drawn to sports cars. She secures some research funds and recruits 100 car buyers to her study. She randomly assigns 25 drivers to each of four groups: 1) sports car white, 2) sports car red, 3) sedan white, and 4) sedan red. The primary research questions are: 1) Do sports cars make people drive faster? and 2) Does color make a difference? The underwriter finds that drivers of red sports cars are the fastest, followed by drivers of red sedans. Her conclusion is that:

Question

Quizplus · Accepted Answer

The study found that drivers of red cars, both sports cars and sedans, drove faster, suggesting that the color red may influence driving speed.

An Insurance Underwriter Wonders Whether Sports Cars "Cause" People to Drive