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# The data presented in the following table give the tensile

ISBN: 9780073401331 38

## Solution for problem 11SE Chapter 8

Statistics for Engineers and Scientists | 4th Edition

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Problem 11SE

The data presented in the following table give the tensile strength in psi (y) of paper as a function of the percentage of hardwood content (x).

a. Fit polynomial models of degrees 1, 2, and so on to predict tensile strength from hardwood content. For each one, use the F test to compare it with the model of degree one less. Stop when the f-value of the F test is greater than 0.05. What is the degree of the polynomial model chosen by this method?

b. Using the model from part (a), estimate the hardwood concentration that produces the highest tensile strength.

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Getzfeld­ Abnormal Psych Week 3: 9/19­9/21 Sigismund (Sigmund) FREUD  Born 1856 May 6­ in Freiberg, Moravia, now Pribor in the Czech Republic  Parents were jewish but Freud was atheist  Oldest of 8 kids. Also had 2 half­brothers  1859: moved to Vienna, Austria  became a medical doctor in 1881  1885­6: 1 yr internship in Oaris  1886: married...

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