For a regression (to predict Y from X1 and X2), is it possible to have a significant R, but non significant b coefficients for both X1 and X2? If so, under what circumstances would this be likely to occur?
Answer to relevant Questions` Suppose that a researcher wants to do a study to assess how scores on the dependent variable heart rate (HR) differ across groups that have been exposed to various types of stress. Stress group membership is originally ...How does orthogonal coding of dummy variables differ from dummy and effect coding? What information do you need to judge the statistical significance, and the effect size for each of these sources of variance: A, B, and A x B? What can the residuals from a regression tell us about possible violations of assumptions for regression? Explain the difference between mediation and moderation.
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