Disney claims that the mean age of its customers is at most 31 years old.

Variety Newspaper, a park newspaper believes this is inaccurate. The newspaper decides to prove the claim wrong by surveying

Disney's customers over a 2 week period as the enter the company. At a 4% level of significance can you conclude that the mean age of Disney's customers is greater than 31 years?

Data set:

19

17

13

23

32

54

56

34

22

43

28

34

36

29

29

9

38

22

32

44

56

43

45

14

56

32

56

11

22

Please show formulas using excel.