THIS IS DATAPLOT TEXT FILE NORPPCC.TEX PERCENT POINTS OF THE NORMAL PROBABILITY PLOT CORRELATION COEFFICIENT TEST FOR NORMALITY. REFERENCE--FILLIBEN, JAMES J. (1975) "THE PROBABILITY PLOT CORRELATION COEFFICIENT TEST FOR NORMALITY", TECHNOMETRICS, VOL. 17, NO. 1, FEBRUARY 1975, PAGES 111-117. EXAMPLE OF USE-- QUESTION: SUPPOSE THE ANALYST HAS 15 OBSERVATIONS, AND THE CALCULATED NORMAL PROBABILITY PLOT CORRELATION COEFFICIENT IS .984. IS THE DATA NORMALLY DISTRIBUTED? ANSWER: FROM THE TABLE BELOW, THE 5% POINT OF THE NORMAL PPCC = .937. SINCE THE CALCULATED NORMAL PPCC = .984, THEN (AT THE 5% ALPHA LEVEL) THERE IS NO EVIDENCE FROM THE DATA TO REFUTE THE ASSUMPTION OF NORMALITY. IN PRACTICE, WE WOULD "ACCEPT" THE HYPOTHESIS OF NORMALITY. TO READ THIS INTO DATAPLOT-- SKIP 25 READ NORPPCC.TEX N PP1 PP5 SAMPLE SIZE N 1% POINT 5% POINT ------------------------------------ 3 .869 .879 4 .822 .868 5 .822 .879 6 .835 .890 7 .847 .899 8 .859 .905 9 .868 .912 10 .876 .917 11 .883 .922 12 .889 .926 13 .895 .931 14 .901 .934 15 .907 .937 16 .912 .940 17 .916 .942 18 .919 .945 19 .923 .947 20 .925 .950 21 .928 .952 22 .930 .954 23 .933 .955 24 .936 .957 25 .937 .958 26 .939 .959 27 .941 .960 28 .943 .962 29 .945 .962 30 .947 .964 31 .948 .965 32 .949 .966 33 .950 .967 34 .951 .967 35 .952 .968 36 .953 .968 37 .955 .969 38 .956 .970 39 .957 .971 40 .958 .972 41 .958 .972 42 .959 .973 43 .959 .973 44 .960 .973 45 .961 .974 46 .962 .974 47 .963 .974 48 .963 .975 49 .964 .975 50 .965 .977 55 .967 .978 60 .970 .980 65 .972 .981 70 .974 .982 75 .975 .983 80 .976 .984 85 .977 .985 90 .978 .985 95 .979 .986 100 .981 .987