A knowledge of basic statistics is important for the researcher.
Paired T-Test :
This test is used to compare two different groups of data where the observations cannot be categorized into a few defined categories. (It is used to compare two different populations of data). .
Links to calculate T-Tests online:
T-Test Calculator. These sites allow you to enter individual observations into two groups and perform a T test.
T-Test Calculator. These calculators allow you to perform T-Tests by entering the mean, number of observations and the standard deviation of the two groups.