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April 20, 2014

Homework Help: Statistic

Posted by Ahmad Syukri on Saturday, April 27, 2013 at 6:47am.

A Toyota dealer wants to find out the age of their customers (for advertising purposes). They want the margin of error to be 3 years old. Suppose the sigma is 13 years old. If they want a 90% confidence interval, how many people do they need to know about?

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