Acid rain Researchers studying acid rain measured the acidity of precipitation in a Colorado wilderness area for 150 consecutive weeks. Acidity is measured by ph. Lower pH values show higher acidity. The researchers observed a linear pattern over time. They reported that the regression line pH = 5.43 − 0.0053(weeks) fit the data well.19
(a) Identify the slope of the line and explain what it means in this setting.
(b) Identify the y intercept of the line and explain what it means in this setting.
(c) According to the regression line, what was the pH at the end of this study?
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