Understandable Statistics: Concepts And Methods

12th Edition

ISBN: 9781337517508

Author: Charles Henry Brase, Corrinne Pellillo Brase

Publisher: Cengage Learning

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.

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Chapter 8.3, Problem 23P

Critical Region Method: Testing Proportions Solve Problem 11 using the critical region method of testing. Hint: See Problem 22. Compare your conclusions with the conclusions obtained by using the P-value method. Are they the same?

22. Critical Region Method: Testing Proportions Solve Problem 9 using the critical region method of testing. Since the sampling distribution of p ^ is the normal distribution, you can use critical values from the standard normal distribution as shown in Figure 8-8 or part (c) of Table 5, Appendix II. Compare your conclusions with the conclusions obtained by using the P-value method. Are they the same?

11. Highway Accidents: DUI The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that 77% of all fatally injured automobile drivers were intoxicated. A random sample of 27 records of automobile driver fatalities in Kit Carson County, Colorado, showed that 15 involved an intoxicated driver. Do these data indicate that the population proportion of driver fatalities related to alcohol is less than 77% in Kit Carson County? Use α = 0.01.

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 8.3, Problem 22P

Chapter 8.3, Problem 24P

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Chapter 8 Solutions

Understandable Statistics: Concepts And Methods

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Solution Summary: The author compares the conclusion of critical value method with the P -value method. The null hypothesis is rejected.

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