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Proportion of US citizens living where carbon monoxide levels are acceptable

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1.) From a sample of 1201 U.S. citizens, it was discovered that 1139 lived in neighborhoods with acceptable levels of cabon monoxide.

A) Obtain a point estimate for the proportion of U.S. citizens who live in neighborhoods with acceptable levels of carbon monoxide.

B) Construct a 98% Confidence Interval for the proportion of US citizens who live in neighborhoods with acceptable levels of carbon monoxide.

C) Suppose you wanted to conduct your own study about proportion of US citizens who live in neighborhoods with acceptable levels of carbon monoide. What sample size would be needed for the estimate to e within 1.5 percentage points with 90% confidence ?

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The proportion of U.S citizens living where carbon monoxide levels are acceptable.

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Confidence Interval & Sample Size
1.) From a sample of 1201 U.S. citizens, it was discovered that 1139 lived in neighbourhoods with acceptable levels of carbon monoxide.
Answers

A) Obtain a point estimate for the proportion of U.S. citizens who live in neighbourhoods with acceptable levels of carbon monoxide.
Point estimate for the proportion of U.S. citizens who live in neighbourhoods with acceptable levels of carbon monoxide, p = x/n = 1139/1201 = 0.948376353

B) Construct a 98% ...

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