Problem 1 Researchers collected samples of water from 172 streams in Upstate New York to investigate the effects of acid rain. The researchers measured the pH (acidity) of the water in each stream and classified the stream with respect to the kind of rock substrate over which the stream flows: limestone (L), shale (S), or Mixed (M). A lower pH means that the water is more acidic. A. Using the attached Statcrunch results, is there sufficient evidence to conclude that the mean pH levels for all streams of at least one type of substrate is different than the others? Use a .05 level of significance. B. If appropriate, use the Tukey HSD confidence intervals to determine which type of substrate results in the most acidic water (i.e., has the lowest mean pH level). Justify your answer.