A t-test is any statistical hypothesis test in which the test statistic follows a Student's t-distribution under the null hypothesis. It can be used to determine if two sets of data are significantly?

different from each other. The t-test assesses whether the means of two groups are statistically different, taking into account sample size and variability. Common applications include comparing the means of two independent samples or paired observations. By calculating the t-statistic and comparing it to a critical value from the t-distribution, researchers can determine the likelihood of observing the data under the null hypothesis.