A music company wants to know how the illegal downloading of music online affects CD sales. 600
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A music company wants to know how the illegal downloading of music online affects CD sales. 600 families are randomly chosen from various parts of a particular country and the number of songs that are downloaded in an hour are noted. The sample mean is 3947 with a sample standard deviation of 104.
Determine a 90% confidence interval for this data.
(Assume that the population variance is not known.)
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