Chi Squared Calculator
Enter the number of rows and columns – remember you do not include row and column totals.
Enter the required significance level of the test.
A table should be created for you to enter the data.
Once the data is entered press Calculate. The calculation and conclusion should be displayed.
Normal Distribution Calculator (from Random Science Tools and Calculators)
Enter the mean, standard deviation, a value for x1 and for x2 if required.
Normal Distribution from (Waldo Maths)
This is for investigation rather than calculation (it may be difficult to set the sliders to the exact values you want), however it could certainly be used to check the magnitude of an answer and provides a useful visualisation.
Enter the mean and standard deviation and move the sliders to the required positions. (Note that it is possible to invert the required area).
