Testing the difference between means.Two samples taken from within a normally distributed population. This calculator works off-line.

Enter the population numbers, the sum of the measurements and the standard deviation of the total population

NUMBER IN POPULATION 1 = SUM OF THE MEASUREMENTS IN POPULATION 1 =
NUMBER IN POPULATION 2 = SUM OF THE MEASUREMENTS IN POPULATION 2 =
Standard deviation of the common population =
Significance level 1% 5% 10%
Z score = Null hypothesis

Mean of population 1 = Mean of population 2 =

Programme written by DJR Hutchon (copyright)

This calculator is for educational use. It is believed accurate but no responsibility for accuracy of the results is accepted by the author. David J R Hutchon BSc, MB, ChB, FRCOG Consultant Gynaecologist, Memorial Hospital, Darlington, England.
Comments and suggestions are welcome and will be included in the comments section. E-mail to me at DJRHutchon@Postmaster.co.uk
1/1/1999