Back to Fit a linear function to a scatter plot — Problem 1 · Task Set 8

Exercises: Fitting a Linear Function to a Scatter Plot

Work through each section in order. When a scatter plot is shown, first decide whether it suggests a LINEAR association before fitting a line. To find a line's equation, read two convenient points ON the line (not necessarily data points), compute slope as rise over run, and find the y-intercept. Remember: a line of fit balances points above and below and need not pass through any data point.

Grade 9·22 problems·~35 min·Common Core Math - HS Statistics and Probability·standard·hss-id-b-6c

Work through problems with immediate feedback

Fluency Practice

Read scatter plots, judge form, and find or use line equations.

$Two scatter plots side by side. The left plot shows points in a roughly straight rising band. The right plot shows points forming a curved arch that rises then falls.$

Two scatter plots are shown. Plot 1 shows points rising in a roughly straight band; Plot 2 shows points rising then falling in a clear arch. For which plot is fitting a linear function appropriate?

Plot 1 only, because its points suggest a linear association.

Plot 2 only, because its curve is more interesting.

Both plots, since a line of best fit always exists.

Neither plot, since the points do not lie exactly on a line.