A sample survey of 56 discount brokers showed that the mean price charged for a trade of 100 shares at $50 per share was $33.85 The survey is conducted annually. With the historical data available, assume a known population standard deviation of $16. a. Using the sample data, what is the margin of error associated with a  90 % confidence interval (to 2 decimals)? $ b. Develop a 90%  confidence interval for the mean price charged by discount brokers for a trade of 100  shares at  $50 per share (to 2 decimal) (, )

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