Lesson 2.2 Linear Regression.

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Presentation transcript:

Lesson 2.2 Linear Regression

Slope and y-intercept Do the investigation on page 171 #1-4.

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We can use the least-squares method to find the equation of a line. Age (years) Annual Income (000) x2 XY 33 25 31 19 18 44 52 50 56 54 60 38 29 35 Sum = Calculate m and b:

Effects of Outliers Textbook see example 3 on page 177.

Practice Questions Page 180 #1, 2 (excel), 3, 4 (excel), 5, 7 When the question says “use linear regression to model these data”, they mean use the least squares formula to calculate the slope and y-intercept (by hand) Practice Questions