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Thirty-two pieces of cotton cellulose were produced at different settings of HCHO concentration

(Conc), catalyst ratio (Ratio), curing temperature (Temp), and curing time (Time). The durable

 press rating (Rating), a measure of wrinkle resistance, was recorded for each product. The linear 

associations between the response, Rating, and the predictors, Conc, Ratio, Temp, and Time,were assessed by multiple linear regression.

Conc Ratio Temp Time Rating

8 4 100 1 1.40000

2 4 180 7 2.20000

7 4 180 1 4.60000

10 7 120 5 4.90000

7 4 180 5 4.60000

7 7 180 1 4.70000

7 13 140 1 4.60000

5 4 160 7 4.50000

4 7 140 3 4.80000

5 1 100 7 1.400008 10 140 3 4.70000

2 4 100 3 1.60000

4 10 180 3 4.50000

6 7 120 7 4.70000

10 13 180 3 4.80000

4 10 160 5 4.60000

4 13 100 7 4.30000

10 10 120 7 4.90000

5 4 100 1 1.70000

8 13 140 1 4.60000

10 1 180 1 2.600002 13 140 1 3.10000

6 13 180 7 4.70000

7 1 120 7 2.50000

5 13 140 1 4.50000

8 1 160 7 2.10000

4 1 180 7 1.80000

6 1 160 1 1.50000

4 1 100 1 1.30000

7 10 100 7 4.60000

4 1 100 1 1.40000

4 1 100 1 1.45000

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Regression Analysis: Rating versus Conc, Ratio, Temp, Time

The regression equation is

Rating = - 0.759 + 0.157 Conc + 0.216 Ratio + 0.0107 Temp + 0.0960 Time

Predictor Coef SE Coef T P

Constant -0.7591 0.7317 -1.04 0.309Conc 0.15691 0.06296 2.49 0.019

Ratio 0.21633 0.03145 6.88 0.000

Temp 0.010724 0.004594 2.33 0.027

Time 0.09601 0.05422 1.77 0.088

S = 0.806964 R-Sq = 73.1% R-Sq(adj) = 69.1%

Analysis of Variance

Source DF SS MS F P

Regression 4 47.838 11.959 18.37 0.000

Residual Error 27 17.582 0.651

Total 31 65.420

Source DF Seq SS

Conc 1 8.886

Ratio 1 33.102

Temp 1 3.808

Time 1 2.042

Unusual Observations

Obs Conc Rating Fit SE Fit Residual St Resid

9 4.0 4.800 3.172 0.194 1.628 2.08R

R denotes an observation with a large standardized residual.