Below a random sample of ten weekdays from three shops. The data collected was daily sales(in thousands of dollars).

Shop 1 Shop 2 Shop 3

6 1 26

7 2 27

8 3 28

9 4 29

10 9 30

11 11 31

11 16 31

12 17,5 32

13 18.5 33

14 19 34

1) Find the mean and sample standard deviation of daily sales for Shop 1

2) Comment on how the daily sales distributions of the three stores differ in terms of dispersion.

3) Do daily sales differ between the three stores? You should give a brief justification of your answer and you should provide estimates of any differences you find.

4) Find the coefficient of variation for the three stores and comment on any differences between the stores.