Consider the following data obtained in a study of the relationship between two variables.
![1761_study of the relationship between two variables.png](https://secure.tutorsglobe.com/CMSImages/1761_study of the relationship between two variables.png)
a. Rank the observations in each sample separately, and find each difference between the ranks, di.
b. Find the sample correlation coefficient between the ranks.
c. Find Spearman's rank correlation coefficient using the differences, di.
d. Explain why the values in parts (b) and (c) are different.