13th Edition

ISBN: 9780134462455

Author: Mario F. Triola

Publisher: PEARSON

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Chapter 9.2, Problem 23BSC

Larger Data Sets. In Exercises 21–24, use the indicated Data Sets in Appendix B. The complete data sets can be found at www.TriolaStats.com. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal.

23. Birth Weights Refer to Data Set 4 “Births” and use the birth weights of boys and girls. Test the claim that at birth, girls have a lower mean weight than boys.

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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Chapter 9.2, Problem 22BSC

Chapter 9.2, Problem 24BSC

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Solution Summary: The author concludes that there is sufficient evidence to support the claims that girls have a lower mean weight than boys.

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