Two separate surveys were carried out to investigate whether the users of East Coast Expressway are in favor of raising the speed limit on highways. From 250 car drivers interviewed, 30 were not in favor of raising the speed limit. While among 200 motorcyclists interviewed, 20 were not in favor of raising the speed limit. Find a 93% confidence interval for the difference of population proportion between the car drivers and motorcyclists who are in favor of raising the speed limit. Interpret the interval.

MATLAB: An Introduction with Applications
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Two separate surveys were carried out to investigate whether the users of East Coast Expressway are in favor of raising the speed limit on highways. From 250 car drivers interviewed, 30 were not in favor of raising the speed limit. While among 200 motorcyclists interviewed, 20 were not in favor of raising the speed limit. Find a 93% confidence interval for the difference of population proportion between the car drivers and motorcyclists who are in favor of raising the speed limit. Interpret the interval.
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