T-test is a statistical test that is used to compare the means of two sets of data. It is used to determine if the means of two samples are significantly different from each other or not. This test is also referred to as the Student’s t-test, or the independent two-sample t-test.

T-test can be used to compare two sets of data that are independent (not related to each other) or dependent (related to each other). In a dependent test, the same group of measurements are taken twice (or more). In an independent situation the two samples would not have any relationship.

The t-test finds the difference between the means of two sets of data and compares it to the variability within the sample. The two variables are then compared to see if the difference between them is statistically significant or not. If the difference is significant, then the result is that the two set of data come from different populations, and one can conclude that the difference between the two sets is meaningful.

T-test is often used to compare means of two populations or samples, or to measure the relationship between two variables. It is also used to test hypotheses such as whether a difference can be observed in two samples, or whether a certain mean value exists. The t-test is a commonly used test in computer studies, such as software engineering and robotics, to validate the results of simulations and experiments.

When interpreting a t-test, it is important to pay attention to the size of the sample, the degree of freedom and the degree of significance. The degree of freedom refers to the number of degrees of freedom within the equation and can help determine the reliability of the results. The degree of significance (or p-value) is an important factor, as it helps to determine the probability that the difference between the means is real.

Overall, the t-test is a useful and powerful statistical tool for comparing the means of two sets of data. It helps to understand the relationship between two variables, as well as whether the difference between two sets is significant and meaningful.