# Discussion Question

*label*Mathematics

*timer*Asked: Dec 20th, 2018

*account_balance_wallet*$25

**Question description**

One can calculate the 95% confidence interval for the mean with the population standard deviation known. This will give us an upper and a lower confidence limit. What happens if we decide to calculate the 99% confidence interval? Describe how the increase in the confidence level has changed the width of the confidence interval. Do the same for the confidence interval set at 80%. Include an example with actual numerical values for the intervals in your post to help with your explanations.

## Tutor Answer

See attached

Confidence Intervals

A confidence interval gives an upper and lower limit within which we would expect a population

parameter to lie in at the specified confidence level. A confidence interval for the mean thus

gives an upper and lower limit with which we would expect the population mean to lie in

For example: If a sa...

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