2.4 ­ Scatter Plots and Lines of Best Fit
Objective: To create a scatter plot with given data and find the line of best fit to help interpret that data.
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In baseball, the on­base percentage for a team represents the percentage of time that players safely reach base. The data below represents the number of runs scored y and the on­base percentage x for teams in the National League during the 2003 baseball season.
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Use a graphing utility to create a scatter diagram using the given data
Turn stat plot1 on
type: scatter diagram
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Go to STAT
Go to edit
Enter x values into L and y values into L
1
2
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In baseball, the on­base percentage for a team represents the percentage of time that players safely reach base. The data below represents the number of runs scored y and the on­base percentage x for teams in the National League during the 2003 baseball season.
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1) Use the data to find the line of best fit to the data. Express the solution using function notation.
f(x) = 62.17x ­ 1315.53
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2) Interpret the slope
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3) Determine whether or not this has a strong linear relation.
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Turn to page 105 and let's do #52 together
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Homework: pg. 105
#'s: 53, 54
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