00:01
Okay, so here we are, we have the values of the same 15 students in two subjects a and b are given to us, and the two numbers within the brackets are denoting the ranks of the same students in a and b respectively.
00:16
So we have the points 1, 10, 27, 3, 2, 6, 5, 4, 6, 8, 7, 8, 1, 11, 10, 15, 11, 11, 12, and 15, and 15, 13, and 15, 13, and we're at, here to use pyramid's formula to find the rank correlation coefficient.
00:36
So the calculation here, we get that r, which is the rank correlation coefficient, is going to be equal to 1 minus 6 times the sum of d squared, where d is the difference between the ranks of the two items, and then divided by n times n squared minus 1, where n is the number of observations.
00:55
So we calculate here the values, and then substitute in its value into our formula...