The license is generated based on a number for the named option and a file maps these features back to the name of the option. The option codes are specific to the option name and the Pro/ENGINEER config id, and can be found listed on the Pro/ENGINEER License Pack.
A test statistic is a standardized value that is calculated from sample data during a hypothesis test. You can use test statistics to determine whether to reject the null hypothesis. The test statistic compares your data with what is expected under the null hypothesis.
Using SPSS and PASW/Paired Samples t-test. A paired samples t-test is a test that is useful when you have two interval/ratio variables from the same people in a sample that are measured exactly the same way. You can use a paired samples t-test to compare the scores on the two variables.