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An economist reports that 1,144 out of a sample of 2,600 middle-income American households actively participate...

An economist reports that 1,144 out of a sample of 2,600 middle-income American households actively participate in the stock market.

A) Find the lower bound of the 99% confidence interval for the proportion of middle-income Americans who actively participate in the stock market. (Round intermediate calculations to 3 decimal places. Round "z-value" and final answers to 3 decimal places.

B) Find the upper bound of the 99% confidence interval for the proportion of middle-income Americans who actively participate in the stock market. (Round intermediate calculations to 3 decimal places. Round "z-value" and final answers to 3 decimal places.

C)

Can we conclude from the previous answers that the proportion of middle-income Americans who actively participate in the stock market is not 48%?

Yes, since the confidence interval contains the value .48.

No, since the confidence interval does not contain the value .48.

No, since the confidence interval contains the value .48.

Yes, since the confidence interval does not contain the value .48.
Math   Statistics-And-Probability   
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