I solved it.
Thread closed.
One of the formulae for coefficient of correlation is given as
-----eq(1)
For coding method of bivariate frequency table, it's given as
-----eq(2)
I need to derive eq(2).
I began by , where c is class interval, and and got
, similarly , but I do not know how to get to
I have a hunch that I need to make a table, but how?
Can anyone point me in the right direction?