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In a random sample of four mobile devices the mean repair cost was 70 00...

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Algebra

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In a random sample of four mobile devices the mean repair cost was 70 00 and the standard deviation was 13 50 Assume the population is normally distributed and use a t distribution to find the margin of error and construct a 90 confidence interval for the population mean Interpret the results The 90 confidence interval for the population mean u is 0 Round to two decimal places as needed

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