NORMAL_VARIANCE
  Compute mean and variance of samples from N(0,1).

         N        E(X)          E(X^2)        V1            V2            V3            V4

         1      0.551688      0.304359      0.000000      0.000000           NaN      0.304359
        10     -0.412511      0.742283      0.572118      0.572118      0.635686      0.742283
       100     -0.120895      1.061153      1.046538      1.046538      1.057109      1.061153
      1000     -0.041898      1.011750      1.009994      1.009994      1.011005      1.011750
     10000      0.010875      0.981807      0.981688      0.981688      0.981786      0.981807
    100000      0.001022      0.990334      0.990333      0.990333      0.990343      0.990334
   1000000      0.000021      1.000187      1.000187      1.000187      1.000188      1.000187