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In: Statistics and Probability

What estimates, with reasonable assurance, can PLE give customers for response times to customer service calls?

What estimates, with reasonable assurance, can PLE give customers for response times to customer service calls?

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Given

What estimates, with reasonable assurance, can PLE give customers for response times to customer service calls?

The Excel file Performance Lawn Equipment can be found at the website.

www.pearsonhighered.com/evans

Locate Books by James Evans, Business Analytics 1/e.

Click the Online Data Files link.

Open Performance Lawn Equipment .xlsx

Use the AVERAGE and STDEV.S functions in Excel to compute the mean and standard deviation of the response times in the Response Time worksheet as shown below.

The result is shown below

Use the Population Mean Sigma known worksheet in Confidence Intervals.xlxs to find the 95% confidence interval of response times as shown below.

Confidence Interval for Population Mean, Standard Deviation known

Alpha 0.05
Standard deviation 1.64
Sample size 400
Sample average 3.47
Confidence Interval 95%
Error 0.160717047
Lower 3.309282953
Upper 3.63717047

We are 95% confident that the true population mean response times to customer service calls in between 3.31 and 3.63

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orchestra answered 2 years ago
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