Answer all questions with explanation

IGA wants to see if their weekly sales values have any impact on their weekly share returns (with a one-week delay).

The relevant values over 8 weeks are shown below.

Week Sales revenue in week ($millions)

22

14

18

25

30

9

15

21

Share return for (week + 1) -

1. 5.16% 2. -2.34% 3. 2.67% 4. 7.50% 5. -4.40% 6. 4.55% 7. -3.26% 8. -2.72%

a) Calculate Spearman's rho for this data. Show full working.

b) Calculate Kendall's tau for this data. Show full working.