Mathematics of Poker: Question on page 72 (x-post in books)

[1p0kerboy]

Where the author is doing a standard deviation problem about a third of the page down he says that 2/sqtN=0.005.

Where did he come up with 0.005? Did this come from the confindence level and winrate accuaracy desired?

[Tiki]

0.005 is the Standard Error required for a 95% CI. He wanted to know his true win-rate to within 0.01 BB/h (ie 1bb/100hands).

2*SE=0.01 (for 95% CI)

SE = 0.005