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3. The US. Department of Transportation, National Highway Safety Traffic Safety Administration reported that 77% of...

3. The US. Department of Transportation, National Highway Safety Traffic Safety Administration reported that 77% of all fatally injured automobile drivers were intoxicated. A random sample of 65 automobile driver fatalities in Dallas County (1996) showed that 43 involved an intoxicated driver. Construct a 96% confidence interval to estimate the proportion of all Dallas County automobile driver fatalities who were intoxicated. Based on your interval, do you think that
the Dallas County rate is substantially lower than the national rate? Justify your answer.
4. In a random sample of 100 voters in a school district, 40 of them stated they were in favor of the school district bond election. Find a 95% confidence interval for the true proportion of all district voters who favor the bond election. Interpret the interval in the context of the problem.
Math   Statistics-And-Probability   
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