41. The table below gives the weights, rounded to the nearest pound, at birth and at 1 year for 5 boys. A researcher models these weights as a linear function where the weight at 1 year is dependent on the weight at birth. Among the following models, which is best?

Answer and Explanation

Your Answer is

Correct Answer is A

Explanation

Succinct method: Mark each point in the coordinates, and you can see that the slope is about 3. Or substitute the maximum data (10, 30) and minimum data (5, 16) into y = kx + b to solve the linear analytical formula. A is the closest.

The rigorous method is to find the regression line equation in statistics, which is very cumbersome. You can search for "regression line equation" or "least square method" to view the solution steps.