When the x1’s, x2’s, . . . , and/or the xk’s are equally spaced, the calculation of the β^’s can be simplified by using the coding suggested in Exercise 14.15. Rework Exercise 14.80 coding the x1-values – 1, 0, and 1 and the x2-values –1 and 1. (For the coded x1’s and x2’s, call them z1’s and z2’s, we have not only ∑z1 = 0 and ∑z2 = 0, but also ∑z1z2 = 0.)
Answer to relevant QuestionsThe regression models that we introduced in Sections 14.2 and 14.6 are linear in the x’s, but, more important, they are also linear in the β’s. Indeed, they can be used in some problems where the relationship between ...For the one-way analysis of variance with a independent samples of size n, show that To compare the effectiveness of three different types of phosphorescent coatings on airplane instrument dials, eight dials each are coated with the three types. Then the dials are illuminated by an ultraviolet light, and the ...An experiment was performed to judge the effect of four different fuels and three different types of launchers on the range of a certain rocket. Test, on the basis of the following ranges in miles, whether there is a ...Perform a multiple-range test to determine the nature of the differences among the three detergents in Example 15.1. Use the 0.01 level of significance.
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