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The percentage of hardwood concentration in raw pulp, the vat pressure, and the cooking time of...

  1. The percentage of hardwood concentration in raw pulp, the vat pressure, and the cooking time of the pulp are being investigated for their effects on the strength of paper. Three levels of hardwood concentration, three levels of pressure, and two cooking times are selected. A factorial experiment with two replicates is conducted, and the following data are obtained: (Use a=0.05 unless otherwise specified)

Percentage

Cooking

Time

3.0 hrs.

Cooking

Time

4.0 hrs

of Hardwood

Pressure

Pressure

Concentration

400

500

650

400

500

650

2

196.6

197.7

199.8

198.4

199.6

200.6

196.0

196.0

199.4

198.6

200.4

200.9

4

198.5

196.0

198.4

197.5

198.7

199.6

197.2

196.9

197.6

198.1

198.0

199.0

8

197.5

195.6

197.4

197.6

197.0

198.5

196.6

196.2

198.1

198.4

197.8

199.8

  1. Analyze the full model and check for significance
  2. Reduce your model
  3. Check the adequacy of this model
  4. Under what conditions would you run the process

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