The following data give the drying time T of a certain paint as a function
of the amount of a certain additive A.
a. Find the rst-, second-, third-, and fourth-degree polynomials that t
the data, and plot each polynomial with the data. Determine the quality
of the curve t for each by computing J, SJ, S and r2r
2
.
b. Use the polynomial giving the best t to estimate the amount of
additive that minimizes the drying time.

A (oz) 0 1 2 3 4 5 6 7 8 9 T (min) 130 115 110 90 89 89 95 100 110 125