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A wireless company claims that the average of the customers cell phone bill is less than $90.00 per month. A sample of 75 customers reported

A wireless company claims that the average of the customers cell phone bill is less than $90.00 per month. A sample of 75 customers reported that their average monthly bill is $84.25 with a standard deviation of $16.03. Test the claim at = 0.005.

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