HW2 - Biological Statistics II Biometry 3020 / Natural...

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Biological Statistics II Biometry 3020 / Natural Resources 4130 / Stat Sci 3200 Homework 2 Due on Thursday February 11 1. Now that you are familiar with the grade point average data consider the diagnostics problem KNNL 3.3, do all components of this problem except for part e that uses the Brown-Forsythe test, which we did not cover in class. Note use a stem-and-leaf plot in place of doing a dot plot. a. (2 points) Prepare a box plot for the ACT scores i X . Are there any noteworthy features in this plot? boxplot(CH01PR19$ACT) b. (2 points) Prepare a stem-and-leaf plot of the residuals. What information does this plot provide? stem(resid(GPA.lm)) c. (2 points) Plot the residual i e against the fitted values i Y ˆ . What departures from regression model (2.1) can be studied from this plot? What are your findings? d. (2 points) Prepare a normal probability plot (quantile plot) of the residuals. Also obtain the coefficient of correlation between the ordered residuals and their expected values under normality. Test
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HW2 - Biological Statistics II Biometry 3020 / Natural...

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