I have (I think) a relatively basic question concerning paired / unpaired data.
I want to compare the mean number of employees in the same company in the same year across two age groups (under 50 years and over 50 years), using a t-test. My question is simply whether I should be using a paired or unpaired t-test. Clearly, the two groups of employees are composed of different individuals (in the given year), but they also constitute different subgroups of the same workforce / company. Would it be legitimate to apply a paired t-test in this instance, or should the data be treated as unpaired?