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Maybe I've misunderstood something, but I used a 95% confidence interval to calculate that:
http://en.wikipedia.org/wiki/Confidence_interval
<p - z sqrt(p(1-p)/n), p + z sqrt(p(1-p)/n)> = <.19 - 1.96 sqrt(.19(1-.19)/150), .19 + 1.96 sqrt(.19(1-.19)/150)> = <.13, .25>
Don't you think he's got any idea wether he's a winning player when he's played 150 SnGs with a ROI of 19%?
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This is not an appropriate CI calculation for ROI. It would be ok for ITM though. Do you see why?
Indy