What it does

This program implements the non-pooled t-test for two samples where the alternative hypothesis is two-sided or one-sided. The program takes four inputs:

• The first input file is a TABULAR format file representing the first sample and consisting of one column only.
• The second input file is a TABULAR format file representing the first sample and consisting of one column only.
• The third input is the sidedness of the t-test: either two-sided or, one-sided with m1 less than m2 or, one-sided with m1 greater than m2.
• The fourth input is the equality status of the standard deviations of both populations.
• The output file is a TXT file representing the result of the two-sample t-test.

Example

Let us have the first input file representing the first sample as follows:

5
4
8
6
7
2
1
1
0
6
4
5
7
5
3
2
5
8
7
6
4

And the second input file representing the second sample as follows:

2
3
5
1
2
7
5
4
3
2
7
6
0
8
4
6
9
2
4
5
6

Runnig the program and choosing "Two-sided" and "Equal" as parameters will give the following output:

Two Sample t-test

data:  sample1 and sample2
t = -0.3247, df = 40, p-value = 0.7471
alternative hypothesis: true difference in means is not equal to 0
95 percent confidence interval:
-1.720030  1.243839
sample estimates:
mean of x mean of y
4.333333  4.571429