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Carry out the test. The calculator will display a p= value (or if you draw it - it will be the shaded area). This is the type one error. Why? Well if H0 is true then your t-test will come from this distribution. Think of the bell shape as a histogram - you have one value you are comparing to it. Is this value typical of this "histogram"? If the value is near the centre of the bell it is reasonable that it came from it. If it is in the extreme it probably didn't and so we reject H0. The type one error is the probability that we reject H0 given that it is true. H0 assumes the t value comes from this distribution - so it is the probability of getting this value or something more extreme. (i.e. the shaded area. Incidently this is the same way of finding the type one error for any test.