# Question: Automobile pollution In a random sample of 340 cars driven

Automobile pollution: In a random sample of 340 cars driven at low altitudes. 46 exceeded a threshold for the amount of particulate pollution. In a random sample of 85 cars driven at high altitudes. 21 exceeded a threshold for the amount of particulate pollution. Construct a 994 confidence interval for the difference between the proportions for high-altitude and low-altitude vehicles.

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