From a random sample of 1000 Americans, it was discovered that 920 of them lived in neighborhoods with acceptable levels of Carbon Monoxide. (Source: The Environmental Protection Agency)  Obtain a point estimate for the proportion of Americas who live in neighborhoods with acceptable levels of carbon monoxide.  Construct a 90% confidence interval for the proportion of Americans who live in neighborhoods with acceptable levels of carbon monoxide.  Construct a 99% confidence interval for the proportion of Americans who live in neighborhoods with acceptable levels of carbon monoxide.