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  1. power.t.test(n=100, delta=1.0, sd=2.5)
  2.  
Success #stdin #stdout 0.3s 22832KB
stdin
Standard input is empty
stdout
     Two-sample t test power calculation 

              n = 100
          delta = 1
             sd = 2.5
      sig.level = 0.05
          power = 0.8036466
    alternative = two.sided

 NOTE: n is number in *each* group