Table 12 Results from t-tests regarding prices before and after the regulation
| Â | obs | mean | se | sd | 95% conf. Interval | |
|---|---|---|---|---|---|---|
Pre regulation price | 96 | 43,36 | 0,63 | 6,22 | 42,10 | 44,62 |
Post regulation price | 118 | 43,89 | 0,34 | 3,70 | 43,21 | 44,57 |
Combined | Â | 43,65 | 0,34 | 4,99 | 42,98 | 44,32 |
Diff |  | −0,53 | 0,69 |  | −1,89 | 0,82 |
t = -0.7733 | ||||||
degrees of freedom = 211 | ||||||
Ha:diff < 0 | Ha:diff = 0 | Ha:diff > 0 |  |  | ||
Pr (T < t) = 0.2201 | Pr|T| > |t| = 0.4402 | Pr (T > t) = 0.7799 |  |  | ||