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.

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