This dataset contains authentic test results from a multiple-choice test given to several thousand high school students in the United States.
It may be used to demonstrate and investigate how to use Lertap 5 to look for group differences; in this case there were two groups, girls and boys. Test developers were interested in seeing if, among other things, the items were gender fair, that is, of equal challenge (and difficulty) to both genders. This involved a look at "DIF", differential item functioning.
Read all about it here.
The actual data may be downloaded using links on the next page.