55. Bird colonies Refer to Exercise $53$.
(a) Use your calculator to make a residual plot. Describe what this graph tells you about how well the line fits the data.
(b) Which point has the largest residual? Explain what this residual means in context.

By using the calculator to make a residual plot. To plot a graph to check the line fits the data.

Residuals are on the vertical axis and percent returns are on the horizontal axis, representing the difference between actual and expected levels.

In other words, there does not appear to be any distinctive pattern in the data, and the regression line appears to fit the data nicely.

The residual value refers to the part of the variability in a dependent variable fragment that remains after the forecasters have taken account of the variability described in the study.

Predicted values and residuals are presented in the table as follows:

Due to its large deviation from a line, the point $(66,6)$has the largest residuals. This makes it an outlier in the above table.