Looking for a test to find if there is a relationship between 2 groups

Hi all,

I have a data set of two frequencies, one is the frequency of air temperature and the second is the frequency that an activity occurs at that temperature. I am trying to see if there is a relationship between an activity and the air temperature. I have included the histogram to give an idea of what I am working with.

My initial thought was a t-test, however, I am more interested in finding one group (air temp) is effecting the other.

I am sorry if there is a similar question on another thread, it seems like the search function is currently not working.

Thank you for the help!