In a random sample of four mobile devices, the mean repair cost was $85.00 and the standard deviation was $13.00.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 μ is(Round to two decimal places as needed.)The margin of error is $(Round to two decimal places as needed.)Interpret the results. Choose the correct answer below.O A. With 90% confidence, it can be said that the repair cost is between the bounds of the confidence interval.B. With 90% confidence, it can be said that the population mean repair cost is between the bounds of theconfidence interval.O C. If a large sample of mobile devices are taken approximately 90% of them will have repair costs between thebounds of the confidence interval.OD. It can be said that 90% of mobile devices have a repair cost between the bounds of the confidence interval.

It is given that sample mean is 85 and the standard deviation is 13.

Answered: In a random sample of four mobile…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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