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Suppose that a researcher does a study to see how level of anxiety (A₁ = low, A₂ = medium, A₃ = high) is used to predict exam performance (Y).

Set up orthogonal coded dummy variables (O1, O2) to represent linear and quadratic trend, and run a regression analysis to predict exam scores from O1 and O2. What conclusions can you draw about the nature of the relationship between anxiety and exam performance?

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Category:- Statistics and Probability
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