1. The scatterplot shows the relationship between the length (x) and ideal weight (y) of sand sharks

in

inches

:

a) Is the relationship positive or negative? Explain

b)

If

=

142

.

86

+

4

.

143

1

:

y

-

intercept:

c) Interpret the correlation coefficient r=.99 in the context of

the problem.

d) Calculate the coefficient of determination

2

and interpret.

e) If in fact, a sand shark with length 66 (in) has an ideal weight of 131 inches, based on the regression

line,

what is the predicted ideal weight? What is the residual ?