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# In a random sample of six microwave? ovens, the mean repair cost was ?\$90.00 and the...

In a random sample of six

microwave? ovens, the mean repair cost was ?\$90.00

and the standard deviation was ?\$13.00

Assume the variable is normally distributed and use a? t-distribution to construct a 90?% confidence interval for the population mean ?.

What is the margin of error of ???

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