Homework 2 (Attendance 3) for Statistics 512 Applied Regression ...

(3.3) grade point average, hw2-3-3-gpa-diagnosBoth SAS and the TI–83 calculator can be used here. Before starting theanalysis using the TI–83, sort the data from smallest to largest, by X.*HOMEWORK 2, 3-3, PAGES 144-151;DATA GPAVSCORE;INPUT GPA SCORE X1 X2;INDEX = 1;IF SCORE < 4.85 THEN LEVENEGROUP = 'A';IF SCORE GE 4.85 THEN LEVENEGROUP = 'B';DATALINES;3.1 5.5 105 2.92.3 4.8 113 2.83 4.7 118 3.11.9 3.9 107 2.42.5 4.5 110 33.7 6.2 125 2.43.4 6 115 3.52.6 5.2 121 3.12.8 4.7 117 3.11.6 4.3 111 2.92 4.9 123 3.22.9 5.4 114 3.32.3 5 120 3.43.2 6.3 132 2.61.8 4.6 122 31.4 4.3 110 2.82 5 119 3.33.8 5.9 109 3.42.2 4.1 116 2.61.5 4.7 108 2.7;*3.3(A) BOXPLOT OF TEST SCORES;PROC BOXPLOT DATA=GPAVSCORE;TITLE '3.3(A) BOXPLOT OF TEST SCORES';PLOT SCORE*INDEX;RUN;*3.3(B) (ALMOST) DOTPLOT OF RESIDUALS;PROC REG DATA=GPAVSCORE OUTEST=EST;MODEL GPA = SCORE;OUTPUT OUT=OUTPLOT PREDICTED=PRED RESIDUAL=RESID;RUN;PROC PRINT DATA=OUTPLOT;TITLE '3.3(B) RESIDUALS';VAR GPA SCORE PRED RESID;RUN;PROC CHART DATA=OUTPLOT;TITLE '3.3(B) (ALMOST) DOTPLOT OF RESIDUALS';VBAR RESID;RUN;*3.3(C) RESIDUALS VS PREDICTED;SYMBOL1 V=STAR C=BLACK;PROC GPLOT DATA=OUTPLOT;TITLE '3.3(C) RESIDUALS VS PREDICTED';PLOT RESID*PRED;RUN;