Two-sample t test for bark beetle trapping experiment

Obs treat count y
1 A 373 2.57171
2 A 126 2.10037
3 A 255 2.40654
4 A 138 2.13988
5 A 379 2.57864
6 B 25 1.39794
7 B 64 1.80618
8 B 62 1.79239
9 B 71 1.85126
10 B 54 1.73239
Two-sample t test for bark beetle trapping experiment; Plot of y by treat y 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 treat A B Two-sample t test for bark beetle trapping experiment

Two-sample t test for bark beetle trapping experiment

The TTEST Procedure

 

Variable: y

treat Method N Mean Std Dev Std Err Minimum Maximum
A   5 2.3594 0.2295 0.1026 2.1004 2.5786
B   5 1.7160 0.1828 0.0818 1.3979 1.8513
Diff (1-2) Pooled   0.6434 0.2075 0.1312    
Diff (1-2) Satterthwaite   0.6434   0.1312    
treat Method Mean 95% CL Mean Std Dev 95% CL Std Dev
A   2.3594 2.0745 2.6444 0.2295 0.1375 0.6594
B   1.7160 1.4890 1.9430 0.1828 0.1095 0.5253
Diff (1-2) Pooled 0.6434 0.3408 0.9460 0.2075 0.1401 0.3975
Diff (1-2) Satterthwaite 0.6434 0.3382 0.9486      
Method Variances DF t Value Pr > |t|
Pooled Equal 8 4.90 0.0012
Satterthwaite Unequal 7.6194 4.90 0.0014
Equality of Variances
Method Num DF Den DF F Value Pr > F
Folded F 4 4 1.58 0.6704
Two-sample t test for bark beetle trapping experiment; Summary Panel for y Distribution of y Kernel Normal B A treat 0 20 40 60 80 Percent 0 20 40 60 80 Percent B 0 10 20 30 40 Percent 0 10 20 30 40 Percent A 1.5 2.0 2.5 3.0 y
Two-sample t test for bark beetle trapping experiment; Q-Q Plots for y Q-Q Plots of y -1.0 -0.5 0.0 0.5 1.0 Quantile 1.4 1.6 1.8 y -1.0 -0.5 0.0 0.5 1.0 Quantile 1.4 1.6 1.8 y B -1.0 -0.5 0.0 0.5 1.0 Quantile 2.2 2.4 2.6 y -1.0 -0.5 0.0 0.5 1.0 Quantile 2.2 2.4 2.6 y A