INSTRUCTIONS
Once the applet has finished loading, a "Compute CI" button will appear
on the screen. This may take a minute or two depending on the speed of
your internet connection and computer. Please be patient. If no begin button
appears, it is probably because your browser does not support Java 1.1.
The Chi-square statistic is typically used for making inferences about the population variance. If a sample of size n is drawn from a normal parent population, then the degrees of freedom of sampling distribution of the Chi-square statistic is n-1. The Chi-square statistic is given by:
Chi-square = (n-1)s square/sigma square
Press the "Lab-value" button, choice which parent population you want "Sample from", choice how many times you want "Repeat", then "Run" the lab. You use "Repeat" button to cumulate your repeat values. You can adjust your sample size, see what will happen.