Robbie’s class collected the following view tube data in problem 4-1.

1. Use your calculator to make a scatterplot and graph the least squares regression line (LSRL). Sketch the graph and LSRL on your paper. Remember to put a scale on the $x$-axis and $y$-axis of your sketch. Write the equation of the LSRL rounded to four decimal places.

   Answer (a):

   See scatterplot below. $y = 1.6568 + 0.1336x$

   

2. Using your calculator, determine the residuals. Make a table with the distance from wall (inches) as the first column and residual (inches) in the second column. What is the sum of the squares of the residuals?

• Answer (b):

  See table below.
  Use your calculator to find the sum of the squares of the residuals.

  Distance from wall (in)	Residual (in)
  144	-0.198
  132	0.305
  120	-0.391
  96	0.316
  84	0.219
  72	0.123
  60	-0.374