         The first argument is the difference between the means that you wish
            to be able to detect, here it's the absolute value of the difference
            between the sample mean, and the true mean.
          </p>
<p>
            Then come two probability values: alpha and beta. Alpha is the maximum
            acceptable risk of rejecting the null-hypothesis when it is in fact true.
            Beta is the maximum acceptable risk of failing to reject the null-hypothesis
            when in 