How do I draw scatter plots and find equations of best-fitting lines?
7.1 Draw Scatter Plots and Best-Fitting Lines Example 1 Describe and estimate correlation coefficients Describe the data as having a positive correlation, a negative correlation, or approximately no correlation. Tell whether the correlation coefficient for the data is closest to or a. Solution a.The scatter plot shows a strong _________ correlation. negative So, the best estimate given is r = ____.
So, r is between ___ and ___, but not too close to either one. The best estimate given is r = _____. 7.1 Draw Scatter Plots and Best-Fitting Lines Example 1 Describe and estimate correlation coefficients Describe the data as having a positive correlation, a negative correlation, or approximately no correlation. Tell whether the correlation coefficient for the data is closest to or b. Solution b.The scatter plot shows a weak _________ correlation. positive
7.1 Draw Scatter Plots and Best-Fitting Lines Checkpoint. For the scatter plot, (a) tell whether the data has a positive correlation, a negative correlation, or approximately no correlation, and (b) tell whether the correlation coefficient for the data is closest to or 1. a.positive correlation b.1 1.
7.1 Draw Scatter Plots and Best-Fitting Lines Checkpoint. For the scatter plot, (a) tell whether the data has a positive correlation, a negative correlation, or approximately no correlation, and (b) tell whether the correlation coefficient for the data is closest to or 1. a.approximately no correlation b.0 2.
7.1 Draw Scatter Plots and Best-Fitting Lines Example 2 Approximate the best-fitting line The table below gives the number of people y who attended each of the first seven football games x of the season. Approximate the best- fitting line for the data. x y Draw a __________. scatter plot 2.Sketch a best-fitting line. 3.Choose two points on the line. For the scatter plot shown, you might choose (1, ___) and (2, ___) Write an equation of the line. The line passes through the two points has a slope of:
7.1 Draw Scatter Plots and Best-Fitting Lines Example 2 Approximate the best-fitting line The table below gives the number of people y who attended each of the first seven football games x of the season. Approximate the best- fitting line for the data. x y Use the point-slope form to write the equation. An approximation of the best-fitting line is
7.1 Draw Scatter Plots and Best-Fitting Lines Checkpoint. Complete the following exercise. 3.The table gives the average class score y on each chapter test for the first six chapters x of the textbook. x y a.Approximate the best-fitting line for the data.
7.1 Draw Scatter Plots and Best-Fitting Lines Checkpoint. Complete the following exercise. 3.The table gives the average class score y on each chapter test for the first six chapters x of the textbook. x y b.Use your equation from part (a) to predict the average class score on the chapter 9 test.
7.1 Draw Scatter Plots and Best-Fitting Lines Pg. 260, 7.1 #1-13