confidence improvement accuracy (*)   (**)  (***)
 domain/domain-fn-args.js n=10 args=0        ***      8.49 %       ±2.11% ±2.81% ±3.67%
 domain/domain-fn-args.js n=10 args=1        ***      9.04 %       ±2.20% ±2.94% ±3.84%
 domain/domain-fn-args.js n=10 args=2        ***      9.39 %       ±2.11% ±2.81% ±3.66%
 domain/domain-fn-args.js n=10 args=3        ***     10.46 %       ±2.08% ±2.77% ±3.60%

Be aware that when doing many comparisons the risk of a false-positive
result increases. In this case there are 4 comparisons, you can thus
expect the following amount of false-positive results:
  0.20 false positives, when considering a   5% risk acceptance (*, **, ***),
  0.04 false positives, when considering a   1% risk acceptance (**, ***),
  0.00 false positives, when considering a 0.1% risk acceptance (***)