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i need the formula for the below.

A random sample found that forty percent of 75 Americans were

satisfied with the gun control laws in 2017. Compute a 90% confidence interval for the true proportion of Americans who were satisifed with the gun control laws in 2017. Fill in the blanks appropriately.

A 90% for the true proportion of Americans who were satisifed with the gun control laws in 2017 is (  ,  ) (Keep 3 decimal places)

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