I'm trying to understand whether the number of words used to title a problem are related to the time used to solve that problem. In order to do this, I have derived two vectors from my data-set, one vector contains values from 1 to 7 representing the number of words used to described a problem, the other vector contains the average time values of all the problems defined with a given number of words.

words 1 2 3 4 5 6 7

avg.time to solve (hrs) 450.3 510.1 560.2 631.9 720.4 706.6 690.8

Can I calculate the correlation between the number of words and the average values using the Spearman's rho? Is it correct?

Any reference is welcome

I'm trying to understand whether the number of words used to title a problem are related to the time used to solve that problem. In order to do this, I have derived two vectors from my data-set, one vector contains values from 1 to 7 representing the number of words used to described a problem, the other vector contains the average time values of all the problems defined with a given number of words.

words                    1     2     3     4      5    6     7
avg.time to solve (hrs) 450.3 510.1 560.2 631.9 720.4 706.6 690.8

Can I calculate the correlation between the number of words and the average values using the Spearman's rho? Is it correct?

Any reference is welcome