Confidence intervals and Standard Deviation

Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week. A sample of 65 weekly reports showed a sample meanof 19.5 customer contacts per week. The sample standard deviationwas 5.2. Provide 90% and 95% confidence intervalsfor the population mean number of weekly customer contacts for the sales personnel.

90% Confidence, to 2 decimals:

( __________ , __________ )

95% Confidence, to 2 decimals:

( __________ , __________ )

** Please see the attachment for the complete solution **

We have, 100(1-α)% confidence interval for the population mean is given by,
(please see the attached …

This solution illustrates the method of determination of confidence intervals.