I have some trouble with the last test I need to perform for my bachelor thesis. I have two variables and I need to test whether there is a significant difference. The first variable has all the returns of stocks on specific days. The second variable has these returns as well, however some days have been deleted. I want to test whether there is a significant difference between 'before' and 'after' the filtering. Is it OK if I perform a Paired Sample T-test, or should I use another test?
Every help is very appreciated!