title: np.std(ddof=1) and statistics.pstdev given different answers
body: <p><a href="https://i.stack.imgur.com/QKCtY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QKCtY.png" alt="enter image description here"></a><a href="https://i.stack.imgur.com/fepwv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fepwv.png" alt="enter image description here"></a></p>
  
  <pre><code>population_std = np.std(final_array)
  sample_std = np.std(final_array, ddof=1)  #  ??
  print(population_std,sample_std)
  
  sample_static_std = statistics.stdev(final_array,)
  populate_stat_std = statistics.pstdev(final_array)  # ??
  print(populate_stat_std,sample_static_std,sep=" &lt;-----&gt; ")
  </code></pre>
  
  <p>NP provide more correct values . but i need to know how do i get correct values from statistic lib. i think statistic lib automatically round up the number . how can i fix this issue ? </p>