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Mathematics 9 Online
OpenStudy (anonymous):

A random sample of 45 trading days is taken and the volume of a particular stock is recorded to determine whether the mean volume of the stock has changed from its 2007 value of 35.14 million shares. The sample resulted in mean trading volume of 39.48. Assume a population standard deviation of 15.07; calculate and interpret a 99% confidence interval for the population mean volume.

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