Question: Consider the following 15 pairs of data:

(5, 4), (8, 7), (5, 5), (4, 3), (5, 6), (9, 7), (7, 4), (3, 1), (8, 5), (8, 6), (6, 4), (6, 3), (7, 6), (9, 8), (4, 1)

a) Find the value of Pearson's Correlation Coefficient (r).

b) Construct a 95% confidence interval of correlation coefficient by R.A. Fisher's method.

c) Test the significance of Pearson Correlation Coefficient at 0.05 level.