Function: calc[ZtestPower] - power function of a Z test 

Calling Sequence:  

ZtestPower
Parameters: 

Side - Left, Right, LR. Specifies an appropriate alternative hypothesis, one-sided: Left or Right, two-sided: LR.
- null hypothesis.
- standard deviation of the distribution.
  - sample mean.
 n - sample size.
  - significance level.
  - make a choice of and the corresponding power (),
           where is the probability of Type II error , then
 N - returns the sample size necessary to give the selected power ().  

Description: 

• ZtestPower  computes the critical value(s) of the statistical test, the probability value (-value) and illustrates the test :   against the alternative hypothesis :    ,   or    graphically by animation. The power function K is scaled to fit the height of the Gaussian curve

Examples: 

>	restart: with(calc):

 

>	ZtestPower(LR,73,7,78.5,10,0.05,N,78,.80);