=+function of elapsed time (hr) under specified conditions. The following data was read from a graph in the article: n 5 33; x 5 .17, .33, .50, .67, . . . , 5.50;

y 5 .50, 1.25, 1.50, 2.75, 3.50, 4.75, 5.75, 5.60, 7.00, 8.00, 8.25, 9.50, 10.50, 11.00, 10.75, 12.50, 12.25, 13.25, 15.50, 15.00, 15.25, 16.25, 17.25, 18.00, 18.25, 18.15, 20.25, 19.50, 20.00, 20.50, 20.60, 20.50, 19.80.

a. The r 2

value resulting from a least squares fit is

.977. Interpret this value and comment on the appropriateness of assuming an approximate linear relationship.