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Confidence Limits, Confidence Level, Confidence Interval for a Mean, Confidence Interval for Difference between Two Means

Confidence Limits


Confidence limits are the lower and upper boundaries of a confidence interval. In our Acme example, the limits were 20 and 24.

Confidence Level


The confidence level is the probability value attached to a given confidence interval. It can be expressed as a percentage (in our example it is 95%) or a number (0.95).

Confidence Interval for a Mean


A confidence interval for a mean is a range of values within which the mean (unknown population parameter) may lie.

Examples of Confidence Interval for a Mean

* A Web master who wishes to estimate her mean daily hits on a certain webpage.
* An environmental health and safety officer who wants to estimate the mean monthly spills.

Confidence Interval for the Difference between Two Means


A confidence interval for the difference between two means specifies a range of values within which the difference between the means of the two populations may lie.

Examples of Confidence Interval for the Difference between Two Means

* A Web master who wishes to estimate her difference in mean daily visitors between two websites.
* An environmental health and safety officer who wants to estimate the difference in mean monthly spills between two production sites.
Copyright © 2000-2010 Michael G. White. All rights reserved.
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