Stats - Quick Review

6. Explain what the T-test is, why it is useful and when you would use it. T-test provides a way of measuring the overlap between two sets of data; hence using T-test, you are able to tell how significant the difference between two data sets. For instance, a small value of t indicates large overlap; hence the difference between two data sets are highly unlikely to be significant. The t-test is normally applied to sample sizes of between 5 and 30 of normally distributed data.