without wait-system | with wait-system | |
22 | 12 | |
65 | 8 | |
10 | 31 | |
34 | 16 | |
23 | 10 | |
47 | 32 | |
15 | 9 | |
12 | 17 | |
25 | 9 | |
32 | 6 | |
mean | 28.5 | 15 |
sd | 16.9918281 | 9.345230513 |
z-score | 0.205981368 | 1.819109756 |
z= (X - mean)/sd
a)
z-score = 0.20598
= 0.21
b)
z-score = 1.8191
= 1.82
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