8. Ice cream experiment, continued The ice cream experiment was described in Example 17.3.1, p. 621, and

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8. Ice cream experiment, continued The ice cream experiment was described in Example 17.3.1, p. 621, and was analyzed in Examples 17.3.2–17.3.4 and 17.4.1. In Sect. 17.10, p. 657, a new model was suggested that involved a quadratic time trend.

(a) What could account for a quadratic time trend?

(b) Investigate the assumptions on the models with and without the quadratic time trend.

(c) Redo the analyses of Examples 17.3.3 and 17.3.4 for the new model and compare your answers with the original model.

(d) Which model do you prefer and why?

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Design And Analysis Of Experiments

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Authors: Angela Dean, Daniel Voss, Danel Draguljić

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8. Ice cream experiment, continued The ice cream experiment was described in Example 17.3.1, p. 621, and

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Design And Analysis Of Experiments

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