7 Exercise 8-47 Algo 4.68 An economist reports that 1,144 out of a sample of 2,600 middle-income American households actively participate in the stock market. points (You may find it useful to reference the z table.) a. Construct the 99% confidence interval for the proportion of middle-income Americans who actively participate in the stock market. (Round final answers to 3 decimal places.) eBook Confidence interval to Print References b. Can we conclude that the percentage of middle-income Americans who actively participate in the stock market is not 48%? O Yes, since the confidence interval contains the value 0.48. O Yes, since the confidence interval does not contain the value 0.48. O No, since the confidence interval contains the value 0.48. No, since the confidence interval does not contain the value 0.48