title: convert statistics.stdev values to np.std value
body: <p>Is there a way to manually convert the values outputted from statistics.stdev to the value outputted from np.std? I know one takes the standard deviation of the population and the other takes the standard deviation of the sample.</p>
  <p>statistics.stdev([10, 8, 2]) = 4.163331998932266
  np.std([10, 8, 2]) = 3.39934634239519</p>