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UF STA 3024 - Exam 2 Results

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Exam 2 ResultsSTA 3024 Fall20109075604530MedianMean84828078761st Quartile 69.000Median 81.0003rd Q uartile 90.000Maximum 102.00076.269 79.64878.000 84.00013.519 15.918A-Squared 4.76P-Value < 0.005Mean 77.959StDev 14.620Variance 213.756Skewness -0.853990Kurtosis 0.451653N 290Minimum 24.000Anderson-Darling Normality Test95% Confidence I nterval for Mean95% Confidence I nterval for Median95% Confidence I nterval for StDev95% Confidence I ntervalsSummary for Exam2 Differences among the 4 Test Forms?100908070605040301612840100908070605040301612840AExam2FrequencyBC DHistogram of Exam2Panel variable: formOne-way ANOVA: Exam2 versus form Source DF SS MS F Pform 3 2960 987 4.80 0.003Error 298 61190 205Total 301 64149S = 14.33 R-Sq = 4.61% R-Sq(adj) = 3.65% Individual 95% CIs For Mean Based on Pooled StDevLevel N Mean StDev ---+---------+---------+---------+------A 71 79.86 13.78 (--------*-------)B 81 74.04 14.48 (-------*-------)C 83 75.76 15.30 (------*-------)D 67 81.99 13.44 (--------*--------) ---+---------+---------+---------+------ 72.0 76.0 80.0 84.0Pooled StDev = 14.33Differences between the 2 sections?1009080706050403035302520151050100908070605040304433Exam2Frequency7660Histogram of Exam2Panel variable: secTwo-Sample T-Test and CI: Exam2, sec Two-sample T for Exam2sec N Mean StDev SE Mean4433 130 80.9 13.7 1.27660 160 75.6 14.9 1.2Difference = mu (4433) - mu (7660)Estimate for difference: 5.3595% CI for difference: (2.03, 8.66)T-Test of difference = 0 (vs not =): T-Value = 3.17 P-Value = 0.002 DF = 283Comparing Exam 1 and Exam 2 scores 110100908070605040301101009080706050403020Exam 1 [102]Exam2 [102]S 11.5967R-Sq 37.5%R-Sq(adj) 37.3%Fitted Line PlotExam2 [102] = 22.76 + 0.6660 Exam 1 [102]Regression Analysis: Exam2 [102] versus Exam 1 [102] The regression equation isExam2 [102] = 22.76 + 0.6660 Exam 1 [102]S = 11.5967 R-Sq = 37.5% R-Sq(adj) = 37.3%Analysis of VarianceSource DF SS MS F PRegression 1 24050.5 24050.5 178.84 0.000Error 298 40076.2 134.5Total 299 64126.7Paired T-Test and CI: Exam 1 [102], Exam2 [102] Paired T for Exam 1 [102] - Exam2 [102] N Mean StDev SE MeanExam 1 [102] 300 82.370 13.466 0.777Exam2 [102] 300 77.620 14.645 0.846Difference 300 4.750 12.420 0.71795% CI for mean difference: (3.339, 6.161)T-Test of mean difference = 0 (vs not = 0): T-Value = 6.62 P-Value =


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