s²

问题如下：

a. Calculate Cook’s Distance for the last data point. Use built-in regression functions in Excel to assist as needed, such as LINEST.

选项：

解释：

Following the methodology of the first example:

Completing the table:

Y1 is the estimate using the entire data set

Y2 is the estimate using the first nine observations

So the Cook’s distance for the last data point is

$D=\frac{106.552}{2*87.783}=0.61$