3 significant numbers in description

[amirDahari1]

I think there should be three significant numbers when presenting the results, as the rounding can be weird sometimes, and we always deal until this point with 3 significant numbers.

[amirDahari1]

After a conversation with @camsooper, I'm sure this needs to be changed. The confidence level is specific to the phase fraction and the interval, rounding makes it incorrect.

[amirDahari1]

closed with #60