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n a random sample of four mobile devices, the mean repair cost was $65.00 and the standard deviation was $11.50. Assume the population is normally

n a random sample of four mobile devices, the mean repair cost was $65.00 and the standard deviation was $11.50. Assume the population is normally distributed and use a t-distribution to find the margin of error and construct a 95% confidence interval for the population mean. Interpret the results.

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