Question

Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 2900 grams and a standard deviation of 600 grams while babies born after a gestation period of 40 weeks have a mean weight of 3200 grams and a standard deviation of 430 grams. If a 35-week gestation period baby weighs 3250 grams and a 40-week gestation period baby weighs 3550 grams, find the corresponding z-scores. Which baby weighs moremore relative to the gestation period?

Find the corresponding z-scores. Which baby weighs relatively moremore? Select the correct choice below and fill in the answer boxes to complete your choice. (Round to two decimal places as needed.)

A. The baby born in week 40 weighs relatively more since its z-score,___ , is larger than the z-score of _____ for the baby born in week 35.

B. The baby born in week 35 weighs relatively more since its z-score, _____, is smaller than the z-score of _____ for the baby born in week 40.

C. The baby born in week 40 weighs relatively more since its z-score, _____, is smaller than the z-score of ______ for the baby born in week 35.

D. The baby born in week 35 weighs relatively more since its z-score, _____, is larger than the z-score of _____ for the baby born in week

Answer #1

For 32 to 35 weeks:

= 2900

= 600

X = 3250

Z = (3250 - 2900)/600

= **0.5833**

After 40 weeks:

= 3200

= 430

X = 3550

Z = (3550 - 3200)/430

= **0.8140**

Correct option:

**A. The baby born in week 40 weighs relatively more since
its z-score 0.8140 , is larger than the z-score of 0.5833 for the
baby born in week 35.**

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