Hypothesis testing of two data series

Hi, I am new to this forum. :wave: I have a basic understanding of statistics from a module at university. I am currently pursuing research in management, but I have a serious problem with selecting the right statistical method. I would be very grateful if somebody could suggest me the right statistical method for my research.

Here is what I need to test:

I have quarterly data for a couple of financial ratios (for example Return on Equity) for two groups of companies: those with CEOs with MBAs and those without MBAs. I want to test whether the two groups are statistically different.

The first test which came to my mind is the student's T test. My only concern is that this is a data series, so only the results from each quarter would be compared, and hence T test is not suitable. :confused:

Can somebody please suggest me a solution to this problem?

Kind regards