Is the data point P an outlier an influential point both or

Is the data point, P, an outlier, an influential point, both, or neither?

Solution

Hence after seeing the definition we find because new data points are added it need not mean that it is an outlier or influential point.

Here regression for 100 to 400 found out as y = 67.1-0.9x

The purpose of regression line is to estimate for unknown values.

Hence there is nothing new in adding new data point P(399,-292)

And also nothing mentioned about y values at P.

Hence it is neither an outlier nor an influential point.