(Answered) You want to make a statistical model for how long your

Statistics

You want to make a statistical model for how long your salespeople take to sell 100 units. You want your measurements to be accurate to within 2 days. From past measurements, you know the standard deviation on the time to sell 100 units was 21 days. How many salespeople do you need to measure to make your model, assuming you want to be 95% confident?

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