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Suppose you wanted to...

Suppose you wanted to be able to improve the accuracy of the confidence interval in by decreasing the margin of error to 5 calls. Assuming that the sample standard deviation for this score and the confidence level stayed the same, how many weeks of data (i.e. what size of a sample of weeks) would you need to achieve this lower margin of error for each day of the week?

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We are 80% confident the calls on Friday should lie between Friday (1499.9, 1500.3)

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