Question 637440
Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week. 
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A sample of 65 weekly reports showed a sample mean of 19.5 customer contacts per week. The sample standard deviation was 5.2. 

Provide 90% and 95% confidence intervals for the population mean number of weekly customer contacts for the sales personnel.
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90% CI:
x-bar = 19.5
ME = 1.645*5.2/sqrt(65) = 1.0610
CI:::::  19.5-1.0610 < u < 19.5+1.0610
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95% CI:
x-bar = 19.5
ME = 1.96*5.2/sqrt(65) = 1.2642
CI: 19.5-1.2642 < u < 19.5+1.2642
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Cheers,
Stan H.
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