The bar graph shows the differences among age groups onthe Implicit Association Test

Chapter 0, Problem 91

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The bar graph shows the differences among age groups onthe Implicit Association Test that measures levels of racialprejudice. Higher scores indicate stronger bias.(Refer to the graph shown at the bottom of the previous page.)a. The data can be described by the following polynomialmodel of degree 3:S = 0.2x3 - 1.5x2 + 3.4x + 25+ (0.1x3 - 1.3x2 + 3.3x + 5). In this polynomial model, S represents the score on theImplicit Association Test for age group x. Simplify themodel.b. Use the simplified form of the model from part (a) to findthe score on the Implicit Association Test for the group inthe 4554 age range. How well does the model describe thescore displayed by the bar graph?

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