Problem: An online store wants to estimate the intervals on the time customers spend on the website before purchasing an item. The population mean of a set of data is unknown. The sample mean is 18 minutes, and the error bound for the mean is 10, at a 95% confidence level. (So, x¯=18 and EBM=10.) Questions: According to my text book, the standard deviation to the problem above is 5.  Please explain the calculation on how to get the standard deviation of 5 for this problem. Thank you!

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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An online store wants to estimate the intervals on the time customers spend on the website before purchasing an item. The population mean of a set of data is unknown. The sample mean is 18 minutes, and the error bound for the mean is 10, at a 95% confidence level. (So, x¯=18 and EBM=10.)

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According to my text book, the standard deviation to the problem above is 5. 

Please explain the calculation on how to get the standard deviation of 5 for this problem. Thank you!

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