Fc = ( 2122 / k) / Sy.122
 = (2.9879 / 2) / 0.0868
 = 17.2114

The F value in the table for (k) and (n k 1) or 2 and
3 degrees of freedom is 16.04 for the 0.025 level of
probability. This means that the response surface being
calculated is highly significant (the calculated value of
F is larger than the value in the table).




Y


Confidence
 Band


Error in
Estimating
Slope (bi)


'Error in
Estimating
 V


FIG.VI-7. Errors in estimation contributing to a
 confidence band in regression.