Introductory Statistics
Introductory Statistics
3rd Edition
ISBN: 9780135188927
Author: Gould, Robert, Ryan, Colleen N. (colleen Nooter)
Publisher: Pearson,
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Chapter 3, Problem 38SE

Birth Lengths Babies born after 40 weeks gestation have a mean length of 52.2 centimeters (about 20.6 inches). Babies born one month early have a mean length of 47.4 centimeters. Assume both standard deviations are 2.5 centimeters and the distributions are unimodal and symmetric. (Source: www.babycenter.com)

a. Find the standardized score (z-score), relative to all U.S. births, for a baby with a birth length of 45 centimeters.

b. Find the standardized score of a birth length of 45 centimeters for babies born one month early, using 47.4 as the mean.

c. For which group is a birth length of 45 centimeters more common? Explain what that means.

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Chapter 3 Solutions

Introductory Statistics

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