This applet simulates sampling from a population with a mean of 50 and a standard deviation of 10. For each sample, the 95% and 99% confidence intervals on the mean are computed based on the sample mean and sample...

This page generates a graph of the sampling distribution of the difference between two means and displays the probabilities associated with that distribution. Users enter the population standard deviation and the sample...

This applet, created by Ivo Dinov of the University of California, Berkeley, demonstrates the Central Limit Theorem. First, select a distribution (normal, uniform, skewed, custom) and add or delete data points by...

This resource, by journalist Robert Niles, defines and explains standard deviation and the normal distribution. Graphs and a clear list of terms you need to know are given, and links to more of Niles' sites can be found...

The activity is designed to help students develop a better intuitive understanding of what is meant by variability in statistics. Emphasis is placed on the standard deviation as a measure of variability. As they learn...