Confidence interval for hourly rate, how does this look..

[brendons31]

win rate (a) - true hourly rate off pokertracker (PT)number of hours (b) - number of hours off PT
standard deviation (c) - standard dev of hourly rate off PT
condidence level (d) - Insert a level of confidince ie. 95%
Normsinv (e) - Normsiv of confidence level (d)
sqrt (f) - Square root of number of hours (a)

Upper bound - =a+(e*(c/f))

Lower Bound - =a-(e*(c/f))