Math Solutions

(Steps Shown) An economist claims that when the Dow-Jones average increases, the number of block trades of 10,000 shares or more tends to increase. Over the

Question: An economist claims that when the Dow-Jones average increases, the number of block trades of 10,000 shares or more tends to increase. Over the past two years, the average daily number of block trades is 1,510 and standard deviation is 175. A random sample of 81 days on which the Dow-Jones average increases was selected, and the average daily number of trades was found to be 1,560. Construct a 97% confidence interval for the average number of trades when the Dow-Jones average increases.

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