Identify the margin of error.

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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I dont know how to find the (Zc) and locate to the Standard normal Distribution? I understand the formula is E=Zc o/n, but each answer I submit is incorrect. 

In a random sample of seven people, the mean driving distance to work was 21.4 miles and the standard deviation was 6.8 miles. Assuming the population is normally distributed and using the t-distribution, a 99% confidence interval
for the population mean u is (11.9, 30.9) (and the margin of error is 9.5). Through research, it has been found that the population standard deviation of driving distances to work is 5.8. Using the standard normal distribution with the
appropriate calculations for a standard deviation that is known, find the margin of error and construct a 99% confidence interval for the population mean u. Interpret and compare the results.
Identify the margin of error.
(Round to one decimal place as needed.)
Transcribed Image Text:In a random sample of seven people, the mean driving distance to work was 21.4 miles and the standard deviation was 6.8 miles. Assuming the population is normally distributed and using the t-distribution, a 99% confidence interval for the population mean u is (11.9, 30.9) (and the margin of error is 9.5). Through research, it has been found that the population standard deviation of driving distances to work is 5.8. Using the standard normal distribution with the appropriate calculations for a standard deviation that is known, find the margin of error and construct a 99% confidence interval for the population mean u. Interpret and compare the results. Identify the margin of error. (Round to one decimal place as needed.)
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