Question: 2.8 Consider the wire bond pull strength data in Exercise 2.4. Fit a regressor model using all six regressors. (a) Is there an indication that

2.8 Consider the wire bond pull strength data in Exercise 2.4. Fit a regressor model using all six regressors.

(a) Is there an indication that this model is superior to the one from Exercise 2.4?

(b) Find a 95% confidence interval on mean pull strength when x0 = 6.0, x2 = 20, x3 = 30, x4 = 90, x5 = 2.0, and x6 = 2.1. Compare the length of this interval to the one from Exercise 2.7, part (b).

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