Data for Chapter 5 Example for Comparing Difference Between Two Treatment Means 22 13:45 Monday, September 22, 2003 Obs Rep Trt Yield 1 1 1 7 2 2 1 9 3 3 1 10 4 4 1 6 5 5 1 9 6 6 1 7 7 1 2 2 8 2 2 5 9 3 2 3 10 4 2 1 11 5 2 5 12 6 2 2 Proc Means Output for Descriptive Statistics 23 13:45 Monday, September 22, 2003 -------------------------------------------- Trt=1 --------------------------------------------- The MEANS Procedure Analysis Variable : Yield N Mean Std Dev Minimum Maximum ャャャャャャャャャャャャャャャャャャャャャャャャャャャャャャャャャ 6 8.00 1.55 6.00 10.00 ャャャャャャャャャャャャャャャャャャャャャャャャャャャャャャャャャ -------------------------------------------- Trt=2 --------------------------------------------- Analysis Variable : Yield N Mean Std Dev Minimum Maximum ャャャャャャャャャャャャャャャャャャャャャャャャャャャャャャャャャ 6 3.00 1.67 1.00 5.00 ャャャャャャャャャャャャャャャャャャャャャャャャャャャャャャャャャ T-test to compare Treatments 1 and 2 24 13:45 Monday, September 22, 2003 The TTEST Procedure Statistics Lower CL Upper CL Lower CL Upper CL Variable Trt N Mean Mean Mean Std Dev Std Dev Std Dev Std Err Yield 6 6.3742 8 9.6258 0.967 1.5492 3.7996 0.6325 1 Yield 6 1.244 3 4.756 1.0445 1.6733 4.104 0.6831 2 Yield Diff (1-2) 2.9257 5 7.0743 1.1266 1.6125 2.8297 0.9309 T-Tests Variable Method Variances DF t Value Pr > |t| Yield Pooled Equal 10 5.37 0.0003 Yield Satterthwaite Unequal 9.94 5.37 0.0003 Equality of Variances Variable Method Num DF Den DF F Value Pr > F Yield Folded F 5 5 1.17 0.8698 Proc Means Statent Used to Produce New Dataset Using Means 25 13:45 Monday, September 22, 2003 Obs Trt _TYPE_ _FREQ_ meanyld 1 1 0 6 8 2 2 0 6 3