11.2.A (a) Find the equation of the least squares straight line for the plant cover diversity/
bird species data given in Question 8.2.ll.
(b) Make the residual associated with the least squares fit asked for in Part (a). Based on the of the residual plot, would you condude that fitting a straight line to these data isappropriate? Explain.
U..2..9. Recall the radioactive contamination problem described. in Case Study 1.2.4. For the
nine in Table

LXj = 4156
i=l
:r_:xr = 2894222

i=J

LY i = 1.416.1
i=l
LXi Yi = 7,439.37

i::cl
Verify th.at the least squares straight line for these points has !.he equation y = + 9.23x. construct the corresponding residual plot. Does it seem to tbal x and y are linearly related?
660 Chapter 11 Regression
11.2.:1.0. Would you have any reservations about fitting the following data with a straight line? Explain.
 x  y 
3  20  
7  37  
5  29  
1  10  
10  59  
12  69  
6  39  
11  58  
8  47  
9  48  
2  18  
 4  29 
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