THE USE OF TWO-SAMPLE t-TEST IN THE REAL DATA

The t-test is one of the most commonly used statistical methods. It was developed and accredited by William Gosset, Karl Pearson and R. Fisher in the 19th century. The test was further developed to the two-sample test (Snedecor and Cochran [10]) which is used to determine whether two populations are equal. A common application of the two-sample t-test is to test whether a process or treatment is superior to a current process or treatment. In this research, using the two-sample t-test, a comparison between the students in the three grades of the Department of Mathematics Education, Tishk International University, is made to see whether there is a significant difference between the grade point averages (GPAs) for the second, third and fourth grades, in addition to gender. The result showed that there is no significant difference on the average scores between grade 4 and grade 3, also no significant difference between grade 4 and grade 2, but there is a significant difference between grade 3 and grade 2. Similarly, there is no significant difference on the average scores due to gender.