(Answered) Question the following values of a response y were obtained

Statistics

Question: The following values of a response Y were obtained for three settings of a categorical predictor A

Suppose we assume the normal regression model for these data with one categorical predictor.

(a) Produce a side-by-side boxplot for the data.

(b) Plot the standardized residuals against A (if you are using a computer for your calculations, also produce a normal probability plot of the standardized residuals) Does this give you grounds for concern that the model assumptions are incorrect?

(d) If warranted, construct 0.95-confidence intervals for the differences between the means and summarize your finding.

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