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An economist reports that 672 out of a sample of 1,400 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. Note: Round final answers to 3 decimal places. b. Can we conclude that the percentage of middle-income Americans who actively participate in the stock market is not 55% ? Yes, since the confidence interval contains the value 0.55 Yes, since the confidence interval does not contain the value 0.55 . No, since the confidence interval contains the value 0.55 . No, since the confidence interval does not contain the value 0.55