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"Consider the Honda Civic's rate of 47 deaths per million registered vehicle years, which is much lower than rates for many other small four-door cars. The Nissan Sentra's rate of 100 per million, for example, is much higher, as are rates for the Geo Prizm (125 per million), Dodge/Plymouth Neon (129), and Kia Sephia (148).
The upper confidence bound for the Civic's death rate is below the lower confidence bounds for the other four cars. This means the lower rate for the Civic isn't due to chance, and it seems likely that differences in the designs of the vehicles play a significant role in the differences between the Honda Civic and the other small cars."