My research involved two types of contextualized tests to examine two types of knowledge of collocations. The first test is a multiple-choice (with 3 options) and it was used to examine receptive knowledge of collocations. The second test is gap-filling and it was used to examine productive knowledge of collocations. Both tests had been done by the same sample size at the same time, but the items in the multiple-choice test are different from the items in the gap-filling test. One of the research questions is to find whether there is a significant difference between receptive knowledge of collocations and productive knowledge of collocations. I normalized the data for both tests and I used a paired-sample t-test to answer this question.
I am wondering whether what I have done by using a paired t-test is correct.