
58 Programming for Chemical Engineers
It is desirable to reject H
0
because by doing so we are stating that the
regression model (the derived equation) explains the variation of the dependent
variable based on the independent variable. Thus, we can conclude that the
values derived from the equation are usable.
Let us consider again Example Problem 2.9. We determine, based on the
previous computation, the following:
υ = 8
r
2
= 0.987242
r = 0.993600
88
.24
987242.01
89936.0
1
2
=
−
=
−
=
r
r
t
υ
From Appendix J, we determined t
critical
(υ = 8, level of significance (two tail
areas) = 0.001 or confidence level = 99.95%) as 5.04, and since t > ...