Find the slope in the linear regression model.
In fitting the simple linear regression model Yi ~ N (α + β xi, σ^{2}) to the following data:
Yi

46.58

47.54

47.58

48.42

48.25

50.3

51.29

xi

3.907

3.828

3.99

4.26

4.399

4.761

5.039

The estimate of the slope is:
1. 13.298
2. 1.242
3. 16.517
4. 4.357
5. 3.507