Question 1 - Relationship among PCB congeners. Consider the following variables: PCB (the total amount of PCB) and four congeners: PCB52, PCB118, PCB138, and PCB180.
(a) Using numerical and graphical summaries, describe the distribution of each of these variables.
(b) Using numerical and graphical summaries, describe the relationship between each pair of variables in this set.
Question 2 - Predicting total amount of PCB using transformed variables, continued. Refer to the previous exercise.
(a) Use numerical and graphical summaries to describe the relationship between each pair of log variables.
(b) Compare these summaries with the summaries that you produced in Question 1 for the measured variables.