ff ff ff ff ff ff
RRECT ANSWERS 2025 ff ff
Normalffdistributionff-ffCORRECTffANSWERff-
afffrequencyffdistributionffthatffisffshapedfflikeffaffsymmetricalffbell,ffunimodalffcurve
Totalffrelativefffrequencyffofffdistributionff-ffCORRECTffANSWERff-areaffunderffcurveff=ff100%ffoffftheffdatafforff1.0
68%ffofffvaluesff-ffCORRECTffANSWERff-%fffallffwithinff1ffstandardffdeviationffofffmean
95%ffofffvaluesff-ffCORRECTffANSWERff-%fffallffwithinff2ffstandardffdeviationsffofffmean
99.7ff%ffofffvaluesff-ffCORRECTffANSWERff-fallffwithffinff3ffstandardffdeviationsffofffheffmean
Normalffcurveffdefinedffbyff-ffCORRECTffANSWERff-meanffandffstandardffdeviation
Rawffscoreff-ffCORRECTffANSWERff-exactffvalueffthatffisffobserved
Standardffscoreff-ffCORRECTffANSWERff-
indicatesffexactlyffhowffmanyffstandardffdeviationsffaffrawffscoreffisffabovefforffbelowfftheffmean.ffZ-score
Whatffisfftheffpurposeffofffcalculatingffz-scores?ff-ffCORRECTffANSWERff-Theffpurposeffofffcalculatingffz-
ffscoresffisfftoffunderstandffaffscore'sffrelativeffstandingffwithinffaffdistribution.ffTheffz-
scoreffstandardizesffscoresfffromffdifferentffdataffsetsffwithffdifferentffmeans
Formulaffforffrawffscorefftoffz-scoreff-ffCORRECTffANSWERff-
Formulaffforffz-scorefftoffrawffscoreff-ffCORRECTffANSWERff-
Formulaffforffsampleffmeanfftoffz-scoreff-ffCORRECTffANSWERff-
ffdividedffbyffstandardfferrorffo/squareffrootffofffsample