Grade 9 Lesson plan
Duskerton Road Salt and Skelbrook Chloride: Residuals and Fit
A 55-minute grade 9 lesson where students fit a least-squares line to six winters of road-salt and stream-chloride data, then read the residuals and the correlation.
Common Core Math · High School
HSS-ID.C.8 Compute and interpret a correlation coefficient
Compute (using technology) and interpret the correlation coefficient of a linear fit.
Why water teaches this standard well
Students compute the correlation coefficient between a watershed's rainfall and its downstream streamflow to judge how tightly the two variables track together. A strong or weak correlation coefficient here gives students a precise number behind a scatter plot's visual impression.
Materials tagged with this code are written to the full standard , and each carries a written note explaining the alignment. See how we review materials.
8 materials aligned to HSS-ID.C.8
Lesson plans
Worksheets
Grade 10 Worksheet
Ledmoor Hollow Storms: A Rainfall and Peak Flow Line of Fit
A grade 10 worksheet where students fit a line to eight fictional storms at a creek gauge, compute residuals, and judge a prediction far outside the data range.
Math problem sets
Grade 11 Math problem set
Merrick Point Jar Test: Coagulant Dose and Turbidity Regression
A grade 11 problem set fitting a line to a fictional jar test's dose and settled turbidity, then predicting, finding residuals, and reading a correlation coefficient.
Grade 11 Math problem set
Tolliver Creek Road Salt: Chloride and Conductance Regression
A grade 11 problem set fitting a regression line to paired conductance and chloride data from a fictional creek, then predicting, checking residuals, and reading r.
Grade 11 Math problem set
Cobalt Bay Desalination: Correlating Production and Energy Use
A grade 11 problem set where students compute and interpret a correlation coefficient between a fictional desalination plant's production and energy use.
Grade 12 Math problem set
Redstone Reservoir: Phosphorus Loading and Algae Growth Regression
A grade 12 problem set using a regression line fitted to a fictional reservoir's phosphorus and algae data to predict, find a residual, and judge extrapolation.
Grade 11 Math problem set
Winterset Well 6: Fitting a Regression Line to a Nitrate Trend
Grade 11 students fit a regression line to fictional groundwater nitrate readings, predict a future value, and compute a correlation coefficient.
Grade 11 Math problem set
Pinewood Creek Streamflow: Fitting a Rainfall Regression Line
A grade 11 statistics problem set where students fit a regression line to eight years of fictional rainfall and streamflow data, then interpret r and r-squared.