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In a random sample of four mobile​ devices, the mean repair cost was ​$65.00 and the...

In a random sample of four mobile​ devices, the mean repair cost was ​$65.00 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 99​% confidence interval for the population mean. Interpret the results.

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