4.2.2 Linear Regression & Correlation Coefficient 1. The correlation coefficients for the six scatter plots shown below are -0.85, -0.40, 0, 0.50, 0.90 and 0.99. Match each scatter plot with the correct correlation coefficient. 2. Multiple Choice. What does it mean to say that data has a strong negative correlation? a. The variables in the data have no relationship at all. b. A linear model is appropriate and the slope of that line is negative. c. There is a negative causation relationship in the data. d. One variable in the data set always has a negative value. Interpret correlation: Since ____ is _________ _____, there is a r= close / far from 1 or -1 ____________ , ___________, linear (strength: Strong/Weak) (direction: Pos/Neg) relationship between ________ and _________. x – variable y- variable 3. Sketch the graph of a scatter plot with the following correlations and interpret the correlation. a. r= 0 b. r= .25 c. r= -.95
4.2.2 Linear Regression & Correlation Coefficient 1. The correlation coefficients for the six scatter plots shown below are -0.85, -0.40, 0, 0.50, 0.90 and 0.99. Match each scatter plot with the correct correlation coefficient. 2. Multiple Choice. What does it mean to say that data has a strong negative correlation? a. The variables in the data have no relationship at all. b. A linear model is appropriate and the slope of that line is negative. c. There is a negative causation relationship in the data. d. One variable in the data set always has a negative value. Interpret correlation: Since ____ is _________ _____, there is a r= close / far from 1 or -1 ____________ , ___________, linear (strength: Strong/Weak) (direction: Pos/Neg) relationship between ________ and _________. x – variable y- variable 3. Sketch the graph of a scatter plot with the following correlations and interpret the correlation. a. r= 0 b. r= .25 c. r= -.95
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