Posted by **Bettie** on Monday, April 8, 2013 at 4:04pm.

The table below reports birth weight and whether the mother smoked for 189 pregnancies. If Smoking and Birthweight were independent, then we would expect the number of low birth weight babies born to smoking mothers to be:

(???/???) * ??? = 23.1

The residual for the corresponding cell of the table is thus:

??? - 23.1 = 6.9.

Birth Weight

Smokes High Med Low Total

No Smoke 42 44 29 115

Smoke 13 31 30 74

Total 55 75 59 189

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