Suppose babies born after a gestation period of 32 to 35 weeks have a mean weigh

Question

Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 2800 grams and a standard deviation of 700 grams while babies born after a gestation period of 40 weeks have a mean weight of 3300 grams and a standard deviation of 415 grams. If a 32-week gestation period baby weighs 3275 grams and a 40-week gestation period baby weighs 3775 grams, find the corresponding z-scores. Which baby weighs more relative to the gestation period? The 32-week gestation period baby weighs standard deviations the mean. The 40-week gestation period baby weighs standard deviations the mean. (Round to two decimal places as needed.)

Explanation / Answer

Z1 = (3275 - 2800)/700 = 0.678571428

Z2 = (3775 - 3300)/415 = 1.1445783

hence

32 -week baby weigh   0.678571428 sd above the mean

40-week baby weigh   1.1445783 sd above the mean

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