12.A dataset in our book contains information

about 53 Florida lakes. Two quantities recorded are the aver-

age mercury level (ppm) in fish taken from a lake and acidity

(pH) of the lake. Recall that in Chapter 2.5 and 2.6 we learned

how to visualize and summarize the relationship between two

quantitative variables such as these. StatKey provides the

following scatterplot and summary information.

n=53, r= -0.575, slope= -0.152, intercept= 1.531

1. What statistic do we use to measure the strength of a linear relationship between two variables? Using appropriate notation, state its value for this sample.

1. What corresponding parameter are we interested in investigating? Use appropriate notation.