where and when use 1 or 2 tail test?

O

overkill6791

New member
Caliper 1Caliper 2
10.26510.264
20.26520.265
30.26630.264
40.26740.266
50.26750.267
60.26560.268
70.26770.264
80.26780.265
90.26590.265
100.268100.267
110.268110.268
120.265120.269

Mean0.266Mean0.266
Stdev0.001Stdev0.002



t-test0.345
used the t-test for this is there a "rule of a thumb" when and why to use 1 and 2 tail test?
 
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