Sixto Sanchez is the owner of Suburban Stylists. He is evaluating the service level provided to

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5. Sixto Sanchez is the owner of Suburban Stylists. He is evaluating the service level provided to walk-in customers. Because he is enrolled in an MBA program at Eastern University, Sixto decides to sample walk-in customers for the next two weeks. He collects information from 82 walk-in customers and calculates that their average waiting times that is 21 minutes with a standard deviation of 4 minutes. (12 pts) 
a) Determine the degrees of freedom to be used in further analysis. 
b) Calculate the two sided 95% confidence interval for the population mean of waiting times. 
c) Calculate the two sided 90% confidence interval for the population mean of waiting times. 
d) Calculate the two sided 99% confidence interval for the population mean of waiting times. 
e) What t table value should be used in calculating a two sided 95% confidence interval for the population mean of waiting times if the sample selected is 25 instead of 82?

    • 9 years ago
    Sixto Sanchez is the owner of Suburban Stylists. He is evaluating the service level provided to
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