That is different from a one sample t test, which compares the mean of your sample to some proposed theoretical value. This calculator uses a two-sample t test, which compares two datasets to see if their means are statistically different.
For example, you might compare whether systolic blood pressure differs between a control and treated group, between men and women, or any other two groups. It is particularly useful for small samples of less than 30 observations. If you are taking the average of a sample of measurements, t tests are the most commonly used method to evaluate that data. Its focus is on the same numeric data variable rather than counts or correlations between multiple variables. A t test is used to measure the difference between exactly two means.
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