1. The problem statement, all variables and given/known data Dear All, I have an urgent probability question. It goes as follows: A chemical tanker spills some chemicals near a coast. A survey team from the local University arrives at the scene and does some measurements. They can 20 samples at 3 different distance from the beach. In the measuring the take into account distance from spill, concentration of chemical and number of effected wildlife in the area. My teacher calls the 3 test sites for observations sites, and wants to show socalled equality of variances between the 3 sites. My question is how do I show equality of vaiances? Is it this formula that I use: http://www.le.ac.uk/bl/gat/virtualfc/Stats/variance.html Best Regards Hummingbird.