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Chapter 14: Being Independent Enough for the Chi-Square Test 261
was substantially more than 0.05, the usual α regular cellphones were found to be statisti-
level. This second result indicates that using cally the same (they could have easily occurred
hands-free equipment didn’t affect the chances by chance under independence). Whether you
of a collision happening; the proportion of colli- use a regular or hands-free cellphone, may this
sions using hands-free cellphones versus using study be a lesson to you!
21_466469-ch14.indd 261 7/24/09 9:51:32 AM
