The manager drew a sample of 30 delivery time in June and found that the mean delivery time is 17 minutes with standard deviation of 2.3 mins and a sample of 30 in August has mean and standard deviation of 17.5 minutes and 2 minutes.  Do a hypothesis testing to determine if the time difference is significant or not.  Use 95 per cent confidence level

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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The manager drew a sample of 30 delivery time in June and found that the mean delivery time is 17 minutes with standard deviation of 2.3 mins and a sample of 30 in August has mean and standard deviation of 17.5 minutes and 2 minutes.  Do a hypothesis testing to determine if the time difference is significant or not.  Use 95 per cent confidence level

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