# Question

Use the model you selected in Exercise 13.77 to answer the following questions.

a. Do the residuals appear to have a normal distribution? Justify your answer.

b. Does the condition of constant variance appear to be satisfied? Justify your answer.

c. Obtain the Box– Cox transformation of this data set.

a. Do the residuals appear to have a normal distribution? Justify your answer.

b. Does the condition of constant variance appear to be satisfied? Justify your answer.

c. Obtain the Box– Cox transformation of this data set.

## Answer to relevant Questions

Use the model you selected in Exercise 13.77 to answer the following questions. a. Do any of the data points appear to have high influence? Leverage? Justify your answer. b. If you identified any high leverage or high ...Refer to Exercise 13.81. a. Fit a second- order model relating math scores to reading scores, % minority, and % poverty with indicator variables for grade level. Does this model appear to provide a substantial improvement in ...Refer to the study described in Exercise 14.8. Use Tukey’s W procedure to identify sig-nificant differences in the means. a. Use Tukey’s W procedure to identify significant differences in the mean attention spans of the ...Refer to Exercise 14.20. a. Test for an interaction between the effects of Mn and Cu on soybean yield. Use α = .05. b. What level of Mn appears to produce the highest yield? c. What level of Cu appears to produce the ...Refer to Exercise 14.1. After running the pilot study, the researchers conduct a study involving 100 students. Twenty- five students were randomly assigned to each of the four instructional conditions. The data are given ...Post your question

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