All the guys who call Lamia has to go through a long waiting time before she  finally picks up the phone. A random sample of 25 such calls from 25 guys  yielded a mean waiting time of 22 minutes with a standard deviation of 6  minutes. Construct a 99% confidence interval for the population mean of  such waiting times. Assume that such waiting times for the population  follows a normal distribution. Also assume that all the guys who calls her  wants to propose.

MATLAB: An Introduction with Applications
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All the guys who call Lamia has to go through a long waiting time before she  finally picks up the phone. A random sample of 25 such calls from 25 guys  yielded a mean waiting time of 22 minutes with a standard deviation of 6  minutes. Construct a 99% confidence interval for the population mean of  such waiting times. Assume that such waiting times for the population  follows a normal distribution. Also assume that all the guys who calls her  wants to propose. 

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