17-18. A regression of infant mortality rates on literacy rates using data from

Question

17-18. A regression of infant mortality rates on literacy rates using data from countries around the world:

A regression of infant mortality rates (deaths per 1,000 births) on literacy rates (as a percentage) using data from countries around the world gives the following equation: Infant mortality = 43.4 - 0.39(literacy rate) What infant mortality rate would you predict for a country with a literacy rate of 78%? About 13 deaths per 1,000 births. About 3.4 deaths per 1,000 births. About 30.4 deaths per 1,000 births. About 43.1 deaths per 1,000 births. This question uses the same equation as in Question previous: If the correlation coefficient between the literacy rate and infant mortality rate is negative 0.84, what is the R2 value for these data? Negative 70.56% 64% 84% 70.56%

Explanation / Answer

17. For literacy rate = 78

Infant mortality = 43.4 - 0.39 (78) = 12.98 = About 13

Option A is correct.

18. R2 = (-0.84)2 = 0.7056 i.e. 70.56%

Option D is correct.

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