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A researcher is investigating the percentage of hardwood concentration in raw pulp, the vat pressure, and the cooking time of the pulp for their effects

A researcher is investigating the percentage of hardwood concentration in raw pulp, the vat pressure, and the cooking time of the pulp for their effects on the strength of paper. Three levels of hardwood concentration, three levels of pressure, and two cooking times are selected. There are 33 experimental units.

Which if any of these effects are fixed, and which if any of these effects are random?

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