Scatter Plots and Trend Lines
S.ID.6.C Fit a linear function for a scatter plot...Also S.ID.6, S.ID.6.a, S.ID.7, S.ID.8, S.ID.9
Goals for this section:
To write an equation of a trend line and a line of best fit to use a trend line and a line of best fit to make predictions.
Scatter Plot:
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.
Trend Line:
A trend line is drawing a straight line that best fits the correlation of the scatter plot.
Interpolation:
Interpolation is estimating a value between two known values.
Extrapolation:
Extrapolation is predicting a value outside the range of known values.
Line of Best fit:
The line of best fit can best be described as the relationship between two sets of data and drawing a straight diagonal line to best represent the data.
Causation:
Causation is when one quantity changes, it also changes the second quantity.
External Resources
An easy example and introduction to scatterplots
Interpreting trend lines for a scatterplots
Constructing a scatterplot