13.6

a. Explain the difference between the line y 5 a 1 bx and the line y^ 5 a 1 bx.

b. Explain the difference between b and b.

c. Let x* denote a particular value of the independent variable. Explain the difference between a 1 bx*

and a 1 bx*.

d. Explain the difference between s and se.