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Many college courses conclude by giving students the opportunity to evaluate the course and the instructor anonymously. However, the use of these student evaluations as an indicator of course quality and teaching effetiveness is often criticized because these measures may reflect the influence of non-teaching related characteristics, such as the physical appearance of the instructor. Researchers at University of Texas, Austin collected data on teaching evaluation score (higher score means better) and standardized beauty score (a score of O means average, negative score means below average, and a positive score means above average) for a sample of 463 professors. The scatterplot below shows the relationship between these variables, and also provided is a regression output for predicting teaching evaluation score from beauty score. o o Beauty Score o 00 8 o 10 Evaluation Score
Call: Im( formula = evals$score - evals$bty_avg) Residuals: Min 10 Median Max -1.9246 -0.3690 0.1420 0.3977 0.9309 30 Coefficients: Estimate Std. Error t value Pr(>t) (Intercept) 3.88034 0.07614 50.96
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