| Regression sample mean | Very negative | Negative | Neutral | Positive | Very positive |
Books | 2.52 | 5 | 4 | 3 | 2 | 1 |
Tutors | 2.02 | 5 | 4 | 3 | 2 | 1 |
Website | 1.90 | 5 | 4 | 3 | 2 | 1 |
Satisfaction from knowledge (estimated, max = 7) | 4.88 | 2.37 | 3.38 | 4.27 | 4.94 | 5.55 |
Satisfaction score difference from previous column | na | na | 1.01 | 0.89 | 0.67 | 0.61 |