Hypothesis test for forecast

Hello,

I need to 'formally test' a forecast, I have the actual data and have created a forecast based on a computed beta (finance) and presume I need to use hypothesis testing to formally test the difference between the forecast and the actual.

Does anyone have any advice on what test to use? I am not sure whether a paired t test is appropriate because I am not certain that the two data classify as paired because all the examples I have read describe paired as the same person tested twice. Should I just look at a t test for difference between means or do you have another suggestion?

Thanks for your help.