The data is below

Determine the range of values in which you would expect to find the average weekly sales for the entire sales force in your company 90% of the time.

• Calculate the impact of increasing the confidence level to 95%?
• Calculate the impact of increasing the sample size to 150, assuming the same mean and standard deviation, but allowing the confidence level to remain at 90%? 

Sales Rep # Average Weekly Sales ($)

1                          1228

2                          7374

3                          1055

4                          1859

5                          3938

6                          1692

7                          569

8                          4059

9                          3689

10                       607

11                       1370

12                       3735

13                       3305

14                       7228

15                       6279

16                       1671

17                       5708

18                       2569

19                       4163

20                       1519

21                       7734

22                       784

23                       6766

24                       7261

25                       5034

26                       7115

27                       6291

28                       6287

29                       2080

30                       7621

31                       1047

32                       6517

33                       5172

34                       3876

35                       5429

36                       4538

37                       3786

38                       2510

39                       4863

40                       7246

41                       1175

42                       641

43                       4269

44                       7034

45                       3406

46                       2256

47                       3182

48                       5178

49                       4428

50                       1189