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Find out the slope in the linear regression model

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

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