MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Transcribed Image Text:In a random sample of four mobile devices, the mean repair cost was $85.00 and the
standard deviation was $12.50. 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.
The 95% 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.
A. It can be said that 95% of mobile devices have a repair cost between the bounds
of the confidence interval.
B. With 95% confidence, it can be said that the population mean repair cost is
between the bounds of the confidence interval.
(
O D. With 95% confidence, it can be said that the repair cost is between the bounds of
the confidence interval.
OC. If a large sample of mobile devices are taken approximately 95% of them will
have repair costs between the bounds of the confidence interval.
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