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