5th Edition

ISBN: 9781323741559

Author: Tannenbaum

Publisher: PEARSON C

Concept explainers

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Z-Scores

A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow compar…

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Textbook Question

Chapter 17, Problem 56E

Exercises 53 through 56 refer to the distribution of weights for infants by age and gender. In all cases you can assume that the weight distribution is approximately normal. The data for these exercises are taken from the 2000 clinical growth charts by the Centers of Disease Control and Prevention (CDC) (www.cdc.gov/growthcharts/clinical_charts.htm).

The distribution of weights for 12-month-old baby boys has mean μ = 10.5 kg and standard deviation σ = 1.2 kg .

a. Suppose that a 12-month-old boy weighs 11.3 kg.

Approximately what weight percentile is he in?

b. Suppose that a 12-month-old boy weighs 8.1 kg.

Approximately what weight percentile is he in?

c. Suppose that a 12-month-old boy is in the 84 t h percentile in weight. Estimate his weight.

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Chapter 17, Problem 55E

Chapter 17, Problem 57E

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Chapter 17 Solutions

EXCURSIONS IN MODERN MATH

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Solution Summary: The author explains the distribution of weights for infants by age and gender with the assumption that the weight distribution is approximately normal.

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