Acid rain Biologists studying the effects of acid rain on wildlife collected data from 163 streams in the Adirondack Mountains. They recorded the pH (acidity) of the water and the BCI, a measure of biological diversity. Heres a scatterplot of BCI against pH: And here is part of the regression analysis: Dependent variable is: BCI R-squared = 27.1% s = 140.4 with 163 - 2 = 161 degrees of freedom Variable Coefficient SE(Coeff) Intercept 2733.37 187.9 pH -197.694 25.57 a) State the null and alternative hypotheses under investigation. b) Assuming that the assumptions for regression inference are reasonable, find the t- and P-values. c) State your conclusion.

Statistics 200 Week One Notes Writing in red are examples of ways to remember what terms go together and what the terms mean. Writing in green are examples of the terms. Chapter One and Two Terms Statistics: The science of learning from data Quantitative Data: Data that is numerical (Quantity = Numbers) Qualitative Date: Data that is categorical (Quality = Category) Inferential Statistics: Methods of drawing conclusions about a population based on information from a sample of the population (Infer = Draw Conclusions) The Six W’s: Who, What, When, Where, Why, and How o Who: Describes the thing that is surveyed o What: Describes the specific characteristics of the who that are measure