Question: A newsgroup is interested in constructing a 90% confidence interval for the proportion of all Americans who are in favor of a new Green initiative.

A newsgroup is interested in constructing a 90% confidence interval for the proportion of all Americans who are in favor of a new Green initiative. Of the 571 randomly selected Americans surveyed, 420 were in favor of the initiative. Find a 90% confidence interval for the proportion of all Americans who are in favor of a new Green initiative.

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