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In: Statistics and Probability

Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week....

Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week. A sample of 55 weekly reports showed a sample mean of 19.5 customer contacts per week. The sample standard deviation was 5.9. Provide 90% and 95% confidence intervals for the population mean number of weekly customer contacts for the sales personnel.

90% Confidence interval, to 2 decimals:

( , )

95% Confidence interval, to 2 decimals:

( , )

A simple random sample of 90 items from a population with = 9 resulted in a sample mean of 38.

If required, round your answers to two decimal places.

a. Provide a 90% confidence interval for the population mean.
to

b. Provide a 95% confidence interval for the population mean.
to

c. Provide a 99% confidence interval for the population mean.
to

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Expert Solution

orchestra answered 1 year ago
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