In Problems, a scatter diagram is given with one of the points drawn in blue. In addition, two least-squares regression lines are drawn: The line drawn in red is the least-squares regression line with the point in blue excluded. The line drawn in blue is the least-squares regression line with the point in blue included. On the basis of these graphs, do you think the point in blue is influential? Why?

Answer

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(a)

We have given a scatter diagram where a blue line drawn include the point in a blue and red line drawn does not include the point in blue.

By these graphs, we are asked whether the point in blue is influential or not.

An...