Based on the results of Exercise 6, speculate about what a non robust smoother might look like. Check your answer with the smoother lowess in S-PLUS. Use the function ancova and the Pygmalion data to...

Based on the results of Exercise 6, speculate about what a non robust smoother might look like. Check your answer with the smoother lowess in S-PLUS.

Use the function ancova and the Pygmalion data to compare the control group to the experimental group using means. What might be affecting power?

Using the Pygmalion data, compare the slope of the regression line of the experimental group to the control group using the biweight midregression estimator.