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Sample Size Variation

The formula below computes the sample size needed to estimate
the population mean within a given margin of error and at a given
confidence level.

Move the sliders to change the values of the population standard
deviation σ , the margin of error E, and the confidence.

How does the sample size change as the standard deviation changes?
How does the sample size change as the margin of error changes?
How does the sample size 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

The value z α/2 is the standard score corresponding to an
area of α/2 in the right tail of the normal distribution, where
α = (100 - confidence)/100.

Created 10/19/2012 by David Gurney using GeoGebra