slide10 
The power of a test

slide15 
The power of tests for proportions

slide20 
The Power of the one sided z test for the mean

slide30 
The non central t  distribution

slide40 
The power of ttest for a normal mean

slide50 
Power and sample size for the onesided ztest for a single normal mean

slide60 
Power and sample size for the one sided ttest for a mean

slide80 
The power of the 2sided ttest

slide90 
The power of the 2sample one and twosided ttests

slide95 
Sample sizes for twosample one and twosided ttests

slide97 
A case study in power
