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Can people really identify their favorite brand of cola? At a= .05, is the correctness of the prediction different for the two types of cola drinkers? Since it is 2 x 2 table, try also a two-tailes two-sample z test for n1 = n^2 and verify that z2 is the same as your chi-square statistic.
COLA
Correct? Regular Diet Row
Cola Cola Total
yes,got
it right 7 7 14

no,got it
wrong 12 20 32

Col total 19 27 46

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