10.64 Index of biotic integrity. Refer to the data on the index of biotic integrity and area in Exercise 10.48 (page 602) and the additional data on percent watershed area that was forest in Exercise 10.49. Find the correlations among these three variables, perform the test of statistical significance, and summarize the results. Which of these test results could have been obtained from the analyses that you performed in Exercises 10.48 and 10.49?