Say your supervisor performs a regression and later find that one of your independent variables (x1) is correlated with another variable that you did not include the regression (x2), and this other variable might better explain the variance in the dependent variable (y). explain what is likely to happen if your supervisor conducts another regression with both of these independent variables included in the model.

Agroup of student volunteers participates in a study designed to assess several behavioral interventions for improving output in a repetitive task. prior to the beginning of the study, all volunteers unknowingly observed, and their output is measured. at the beginning of the study, prior to any intervention, the volunteers perform the same task under the observation of a study administrator, and their overall output increases. which of the following terms describes this phenomenon? a. simpson's paradox b. hawthorne effect are d. novelty effect d. pygmalion effect e. observer-expectancy effect