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**Scatter Plots and Trend Lines**

Ch 10 Students will be able to use a trend line and a line of best fit to make predictions. Scatter Plots and Trend Lines In the Solve It, the number of albums downloaded per year and the number of CDs sold per year are related. Algebra 1 Foundations, pg 363

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Ch 10 Students will be able to use a trend line and a line of best fit to make predictions. A scatter plot is a graph that relates two different sets of data by displaying them as ordered pairs. Most scatter plots are in the first quadrant of the coordinate plane because the data are usually positive numbers. You can use scatter plots to find trends in data. The scatter plots below show the three types of relationships that two sets of data may have. Algebra 1 Foundations, pg 363

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Ch 10 Students will be able to use a trend line and a line of best fit to make predictions. Focus Question How do you write an equation to show trends in data? Make a scatter plot. If there is a correlation, draw the best possible trend line. Use any two points on the trend line to determine the equation of the line. Check your equation with the equation of the line of best fit. Algebra 1 Foundations, pg 363, 367

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Ch 10 Students will be able to use a trend line and a line of best fit to make predictions. Algebra 1 Foundations, pg 364

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Ch 10 Students will be able to use a trend line and a line of best fit to make predictions. Algebra 1 Foundations, pg 364

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Ch 10 Students will be able to use a trend line and a line of best fit to make predictions. When two sets of data have a positive or negative correlation, you can use a trend line to show the correlation more clearly. A trend line is a line on a scatter plot, drawn near the points, that shows a correlation. Algebra 1 Foundations, pg 364

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Ch 10 Students will be able to use a trend line and a line of best fit to make predictions. You can use a trend line to estimate a value between two known data values or to predict a value outside the range of known data values. Interpolation is estimating a value between two known values. Extrapolation is predicting a value outside the range of known values. Algebra 1 Foundations, pg 364

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Ch 10 Students will be able to use a trend line and a line of best fit to make predictions. Algebra 1 Foundations, pg 365

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Ch 10 Students will be able to use a trend line and a line of best fit to make predictions. Algebra 1 Foundations, pg 365

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Ch 5-7 Students will be able to use a trend line and a line of best fit to make predictions. Algebra 1 Foundations, pg 365

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Ch 10 Students will be able to use a trend line and a line of best fit to make predictions. Algebra 1 Foundations, pg 367

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