1. Unit 3 Section 10-4

2. 10-4: Regression  Regression – statistical method used to describe the nature of the relationship between variables.  Positive vs. Negative  Linear vs. Nonlinear  Regression line – the data’s line of best fit.  This is used when the correlation coefficient is significant.  Helps make meaningful predictions about the data.

3.  The form of the linear equation is:  a represents the y’ intercept  b represents the slope of the line  To find a:  To find b: Section 10-4 Determining the Regression Line Equation

4. Constructing a Line of Best Fit  Compute the value of the line of best fit for the data obtained in the study of age and blood pressure given below: SubjectAge (x)Pressure (y) A43128 B48120 C56135 D61143 E67141 F70152 Section 10-4

6. Constructing a Scatter Plot  Determine the line of best fit for the data obtained in a study of the number of absences and the final grades of seven randomly selected students from a statistics class. Subject# of Absences (x)Final Grade (y) A682 B286 C1543 D974 E1258 F590 G878 Section 10-4

8. Homework:  Pg 551-552: #’s 2-9, 13-21 odd