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**A 4-6 What is Regression and Median Fit**

EQ Why is math used to model real-world situations? I will be able to… Write equations of best-fit lines using linear regression Activities: Warm-up Review warm-up Complete quiz activity Review HW Power point lesson: Regression and Median Fit Mid-chapter 4 test Distribute tonight’s HW Vocabulary: best-fit line linear regression correlation coefficient

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**4-6 Regression and Median Fit**

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A Quick Review The table shows the average weight for given heights. Does the data have a positive or negative correlation? Refer to the scatter plot of Jessica’s visits to the park. Use the points (20, 9) and (100, 4) to write the slope-intercept form of an equation for a line of fit. The table shows the average weight for given heights. Approximately how much would you expect a person who is 5’6” tall to weigh? 140 lbs 152 lbs 160 lbs 170 lbs

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A Quick Review Refer to the scatter plot of Jessica’s visits to the park. Predict the number of times Jessica will go to the park when the temperature is 50 degrees. What is an equation of the line of fit that passes through the points at (2, –1) and (–1, –7)?

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Real World Problem EARNINGS The table shows Ariana’s hourly earnings for the years 2001–2007. Use a graphing calculator or phone to write an equation for the best-fit line for the data. Name the correlation coefficient. Round to the nearest ten-thousandth. (No graphing calculator – graph by hand)

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A Real World Problem BIOLOGY The table shows the average body temperature in degrees Celsius of nine insects at a given temperature. Use a graphing calculator to write the equation for the best-fit line for that data. Name the correlation coefficient. (No calculator- graph by hand)

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A Quick Review BOWLING The table shows the points earned by the top ten bowlers in a tournament. How many points did the 15th-ranked bowler earn? Best way is using graphing calculator – alternative graph by hand…

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1 The graph of y = 2x + 3 is shown. You can see that the line’s y -intercept is 3, and the line’s slope m is 2 : m =2 = rise run = 2121 Slope-Intercept.

1 The graph of y = 2x + 3 is shown. You can see that the line’s y -intercept is 3, and the line’s slope m is 2 : m =2 = rise run = 2121 Slope-Intercept.

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