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S2 - Norm watch
- Thread Starter
- 08-04-2011 16:48
- 08-04-2011 17:01
Phi( 3-a / a ) =0.2 ...not in the table since the probabilities for positive z-values are tabulated only.
Equivalent to saying Phi( a-3 /a ) = 1-0.2=0.8
Now use the tables to see which z-value is closest to a probability of 0.8