October 9, 2015

Homework Help: Math

Posted by Leah on Saturday, February 19, 2011 at 9:11pm.

You want to estimate the mean amount spent by customers at a local gas station with 98% confidence and a margin of error of no more than $2. Preliminary data suggests that the standard dev. is $5.1 is a reasonable estimate for the standard dev. for all customers. How large a sample do you need?

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