Use SAS to verify this data Sample size determination date s

Use SAS to verify this data (Sample size determination)

date

sigma =30

nullmean =120

alternative mean =115

1-alpha =0.95

1-beta =.80

Solution

proc power;

      pairedmeans test=diff

         meandiff = 5

         stddev = 30

         npairs = .

         power = .80;

   run;      

As I do not have SAS software but go through this link which will surely solve your problem

http://www.stat.purdue.edu/~bacraig/SCS/Power%20and%20Sample%20Size%20Calculation.doc