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 $\hat{p}$ 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.