Date last tested: 9/27/05.
Comparison of ‘Two-sample Independent t-test’ to other public software programs and statistical textbook.
Two-tailed p-value
|
CI %, n1, mean1, s1 n2, mean2, s2 |
||
Data input |
95%, 7, 11.57142857, 8.81016729, 18, 7.44444444, 3.69772939 |
95%, 64, 54.4375, 12.05657958, 35, 47.42857143, 13.15582115 |
95%, 78, 92.88461538, 15.34451192, 46, 88.02173913, 12.20653583 |
OpenEpi Equal variance Unequal variance |
0.1062 0.2705 |
0.0087 0.0113 |
0.0692 0.0544 |
SAS Equal variance Unequal variance |
0.1062 0.2705 |
0.0087 0.0113 |
0.0692 0.0544 |
GraphPad Software Equal variance Unequal variance |
0.1062 0.2705 |
0.0087 0.0113 |
0.0692 0.0544 |
‘CI’ Confidence
interval; ‘n1’ sample size of
Group 1; ‘s1’ standard
deviation of Group 1 mean; ‘n2’ sample size of Group 2; ‘s2’ standard deviation of Group 2
mean;
Reference:
·
Bernard Rosner.
Fundamentals of Biostatistics (5th edition).
·
SAS Institute
(Statistical Analysis System-version 8,
·
GraphPad
Software. QuickCalc online calculators for scientists. (http://graphpad.com/quickcalcs/ttest1.cfm?Format=SD)