solution

In addition to NOAA-GLERL, several other institutions also have routine monitoring programs on Lake Erie. Data file LakeErie2.csv contains TP and chla concentration data collected by NOAA-GLERL, Ohio Department of Natural Resources (ODNR), and The University of Toledo (Toledo).

(a) Compare the distribution of the TP concentration data from NOAA to the same from ODNR:

• Are the two distributions different?

• If so, is the difference between the two TP concentration distributions more likely to be additive or multiplicative?

• Are the variances of the two distributions the same?

(b) Describe the difference in the two distributions in non-technical terms.

(c) Repeat the previous comparison to compare TP distributions from Toledo and NOAA, and ODNR and Toledo, and summarize the results.