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Find the slope in the linear regression model

In fitting the simple linear regression model Yi ~ N (α + β xi, σ²) 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:

a. 13.298

b. 1.242

c. 16.517

d. 4.357

e. 3.507

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