 final piece of information we need is s sub d, the standard deviation of the differences. Now you recall when we were running the hypothesis of this test I said check that box that saves the differences. Here are our differences and now all we need is a standard deviation of that and we can get that very quickly with summary stats columns and I want to go on the differences and all I really need is a standard deviation compute and we get a standard deviation f sub d of 1.067 which is the answer in the test. So I hope you learn to use your technology tools to help you get through and I hope this helps.