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Confidence Interval Variation

Two confidence intervals for the population mean are shown below.
The top interval changes as the slider values change.
The bottom interval has fixed values to demonstrate how the top interval changes.

How does the confidence interval change as the sample mean, xbar, changes?

How does the length of the confidence interval change as the population standard
deviation, σ, changes?

How does the length of the confidence interval change as the sample size changes?

How does the length of the confidence interval change as the confidence changes?

This is a Java Applet created using GeoGebra from www.geogebra.org - it looks like you don't have Java installed, please go to www.java.com

Created 10/19/2012 by David Gurney using GeoGebra