3.40 Everglades. Continue your work from Exercise 1.45 (page 36) with the data file Large.Everglades.

a. Make a scatterplot matrix displaying the relationship for each combination of 5 variables. There should be 10 different graphs (20 graphs if each variable is used on the x axis and then on the y axis for each combination). Which relationships, if any, are linear?

b. The Shark River ends in the Gulf of Mexico. When the tide comes in, ocean water flows into the river; when the tide goes out, water flows from the river into the ocean. The velocity and discharge variables take positive values when the tide is out, and negative values when the tide is in. Describe again the scatterplot matrix you created in part

a, this time taking into account the tides’ impact (that is, describe the tide in and the tide out separately).