An economist reports that 560 out of a sample of 1,200 middle-income American households actively participate in the stock market. a. Construct the 90% confidence

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An economist reports that 560 out of a sample of 1,200 middle-income American households actively participate in the stock market.
a. Construct the 90% confidence interval for the proportion of middle-income Americans who actively participate in the stock market.
b. Can we conclude that the proportion of middle-income Americans who actively participate in the stock market is not 50%?

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