There were a record 324 automobile fatalities in Connecticut in 1955, which prompted a statewide crackdown on speeding. The next year there were 284 fatalities. What did Campbell conclude from his evaluation of the state's program?
A)regression to the mean occurred and it accounted for the reduction from 324 to 284
B)because the program was so highly publicized, it accounted for the drop from 324 to 284
C)the drop from 324 to 284 was partly due to regression, but the program was also successful to a degree
D)the results could be attributed partly to regression and partly to instrumentation (they defined "traffic fatality" different in 1956)

Question

Quizplus · Accepted Answer

Campbell concluded that the drop in fatalities was partly due to regression to the mean, as extreme values tend to move closer to the average over time, but also that the program had some success in reducing fatalities.

There Were a Record 324 Automobile Fatalities in Connecticut in 1955