Anova zadaci

But!how!large!was!the!statistical!power!for!the!reported! results! of!Warrington! and!Weiskrantz! (1970)! in! the!word" stem! completion! task,! if! we! assume! that! the! underlying! population! means! equalled! ! for! the! amnesic! patient! group!and!16!for!the!control!group?!Let!us!assume!that!the! standard! deviation! of! test! performance! equalled! 3! in! the! underlying! populations! of! each! group! (unfortunately,! neither! the! standard! deviation! of! the! samples! nor! the! empirical! t "values!have!been!reported).! In! GPower !we!have! to!choose!«Post"hoc»!as! type!of!power!analysis!and!« t "Test! (means)»! as! type! of! test! (see! Figure! 1).! Because! the! hypothesis! is! directional—we! want! to! know! whether! controls! are! better! than! amnesics—a! «one"tailed»! test! is! selected.! Next,! we! determine! with! «Calc! “ d ”»! d ! =! (16! –! )/3!=!!as!the!size!of!the!effect!to!be!detected.!An!effect! of! this! size! equals! “medium”! effects! in! terms! of! Cohen’s! (1988)! conventions.!What!was! the! probability! to! find! this! effect!given!a!level!of!!!=!.05?!We!specify!!!=!.05,! n1 !=!4,!and! n2 !=!8.!The! result! is!disillusioning.!The! statistical!power!of! this! test! amounts! to! only! .1887.! GPower ! also! returns! the! critical! t "value! associated!with! the! chosen! !! level,! that! is,! t (10)! =! ,! and! the! noncentrality! parameter! %! =! ! determined! by! sample! size! and! specified! effect! size! d ! (see! Equation!1).!

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