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10000 array insertions took 1.00004911422729 seconds.
11000 array insertions took 1.09900379180908 seconds.
...
Hash inserts:
Y = 0.000215204607047044 * X + -0.176900404356259 with error 0.0075377
+646200501
Y : total time to insert X elements.

  7 +-----------------------------------------------------------------
+-----+   
    |                 +                 +                +            
+     |   
...
  1 +-----------------------------------------------------------------
+-----+   
  10000             15000             20000            25000          
+   30000 
                                   number of items

use strict;
use warnings;
...
    $error = sqrt($error) / $num_observations;
    return { A => $A, B => $B, E => $error }
}