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Water costs for households are now a significant expense. A sample of 16 homes (for September) was taken in Southridge (Denton, TX) had a sample

Water costs for households are now a significant expense. A sample of 16 homes (for September) was taken in Southridge (Denton, TX) had a sample mean of $235 with a sample standard deviation of $48. If we wanted to have a maximum error of $8, what sample size would we need to draw from the population to be 90% confident in our estimate?

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