Straighterline Introduction To Statistics|58 Questions And Answers

Ratio Variable {Ans: quantitative variables for which it makes sense to talk about the difference between values AND the ratio between values; 0 represents the absence of quantity}The Complement Rule {Ans: P(not A) = 1 - P(A) useful for finding events of the type "at least one of..."}What type of variable?: Income {Ans: Ratio}Interpreting Scatterplots: Least Squares Regression Line {Ans: Has the smallest sum of squared vertical deviations of the data points from the line.}Probability sampling plan {Ans: any sampling plan that relies on random selection (avoids bias).}Interpreting scatterplots: 1. positive relationship displays as 2. negative relationship displays as {Ans: 1. upward slope 2. downward slope}