12th Edition

ISBN: 9780321836960

Author: Mario F. Triola

Publisher: PEARSON

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In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.

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Textbook Question

Chapter 12.2, Problem 10BSC

Pelvis Injury Crash Test Data Exercises 1–4 use chest deceleration data for three different size categories (small, midsize, large). The data are from a standard crash test and they are listed in Data Set 13 in Appendix B. If we use the pelvis injury measurements (g) with the same three size categories, we get the XLSTAT results shown here. Using a 0.05 significance level, test the claim that the three size categories have the same mean pelvis injury measurement. Does the size of a car appear to affect pelvis injuries?

XLSTAT

Source	DF	Sum of squares	Mean squares	F	Pr > F
Model	2	79.1429	39.5714	0.3470	0.7111
Error	18	2049.4286	113.8571
Corrected	20	2128.5714

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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Chapter 12.2, Problem 9BSC

Chapter 12.2, Problem 11BSC

Chapter 12 Solutions

Elementary Statistics

Ch. 12.2 - In Exercises 1-4, use the following listed chest...Ch. 12.2 - Prob. 2BSC Ch. 12.2 - In Exercises 1-4, use the following listed chest...Ch. 12.2 - Prob. 4BSC Ch. 12.2 - In Exercises 516, use analysis of variance for the...Ch. 12.2 - In Exercises 516, use analysis of variance for the...Ch. 12.2 - Highway Fuel Consumption Data Set 14 in Appendix B...Ch. 12.2 - City Fuel Consumption Data Set 14 in Appendix B...Ch. 12.2 - Head Injury Crash Test Data Exercises 14 use chest...Ch. 12.2 - Pelvis Injury Crash Test Data Exercises 14 use...

Ch. 12.2 - Prob. 11BSC Ch. 12.2 - Prob. 12BSC Ch. 12.2 - Prob. 13BSC Ch. 12.2 - Prob. 14BSC Ch. 12.2 - Prob. 15BSC Ch. 12.2 - Prob. 16BSC Ch. 12.2 - Tukey Test A display of the Bonferroni test...Ch. 12.3 - Prob. 1BSC Ch. 12.3 - Prob. 2BSC Ch. 12.3 - Prob. 3BSC Ch. 12.3 - Prob. 4BSC Ch. 12.3 - Prob. 5BSC Ch. 12.3 - Car Crash Tests The following table lists results...Ch. 12.3 - Prob. 7BSC Ch. 12.3 - Prob. 8BSC Ch. 12.3 - Self-Esteem The following table lists measures of...Ch. 12.3 - Prob. 10BSC Ch. 12.3 - Prob. 11BB Ch. 12 - Measures of Voltage The author measured voltage...Ch. 12 - Prob. 2CQQ Ch. 12 - Prob. 3CQQ Ch. 12 - Prob. 4CQQ Ch. 12 - Prob. 5CQQ Ch. 12 - Prob. 6CQQ Ch. 12 - Prob. 7CQQ Ch. 12 - Prob. 8CQQ Ch. 12 - Using the same results given in Exercise 8, does...Ch. 12 - Prob. 1RE Ch. 12 - Prob. 2RE Ch. 12 - Tar in Cigarettes Data Set 10 in Appendix B...Ch. 12 - Smoking, Body Temperature, Gender The table below...Ch. 12 - Prob. 1CRE Ch. 12 - Prob. 2CRE Ch. 12 - Prob. 3CRE Ch. 12 - Prob. 4CRE Ch. 12 - In Exercises 1-5, refer to the following list of...Ch. 12 - Freshman 15: Correlation/Regression listed below...Ch. 12 - Platelets: Normal Distribution Based on Data Set 1...Ch. 12 - Job Priority Survey USA Today reported about an...Ch. 12 - Prob. 9CRE Ch. 12 - Lottery: Goodness-of-Fit The bars in the histogram...Ch. 12 - Prob. 10CQQ Ch. 12 - Chocolate Chips Revisited The Chapter Problem for...

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Solution Summary: The author explains that there is no sufficient evidence to reject the claim that the three size categories have the same mean pelvis injury measurement.

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