(Answered) Question in an investigation into the effect of

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Question: In an investigation into the effect of deficiencies of trace elements on a variable Y measured on sheep, the data in the following table were obtained.

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 the predictor (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 all the pairwise differences between the means and summarize your findings.

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