Grade 10 Lesson plan
Vasserly Creek Sampling: Comparing Two Sites by Center and Spread
A 50-minute grade 10 lesson where students compare eight weeks of turbidity readings from two fictional creek sites using mean, median, IQR, and an outlier test.
Common Core Math · High School
HSS-ID.A.3 Interpret differences in shape, center, and spread
Interpret differences in shape, center, and spread in the context of the data sets, accounting for possible effects of outliers.
Why water teaches this standard well
Students interpret why one well's nitrate readings are far more spread out than a neighboring well's, checking whether a single unusual sampling event is skewing the result. Accounting for a possible outlier here is a real quality-control step before trusting a groundwater data set.
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.
16 materials aligned to HSS-ID.A.3
Lesson plans
Grade 11 Lesson plan
Harlow Springs and Odell Flats: Comparing Hardness Spread
A grade 11 statistics lesson comparing the center and spread of two fictional source-water hardness data sets and interpreting how an outlier shifts the mean.
Grade 12 Lesson plan
Aldous and Brenmoor Plants: Comparing Residual Consistency
A grade 12 statistics lesson comparing the mean and spread of daily chlorine residuals from two fictional plants, and testing how one outlier shifts each measure.
Worksheets
Grade 11 Worksheet
Comparing Home Chlorine Readings on Two Brookfield Streets
A grade 11 statistics worksheet on a fictional town's home chlorine readings: compare two streets by IQR and standard deviation, then test an outlier.
Grade 11 Worksheet
Lammermoor Brook Bacteria Counts: The Geometric Mean on a Log Scale
A grade 11 worksheet comparing the arithmetic and geometric means of five skewed bacteria counts, using base-ten logarithms and one added low sample.
Grade 9 Worksheet
Wickcombe's Ivyshaw Row Flush Test: Lead Against Liters Drawn
A grade 9 worksheet using a sequential flush profile from one home's lead service line to practice average rate of change and one-variable equations.
Grade 11 Worksheet
Penncroft Filter Turbidity: A Compliance Report Worksheet
A grade 11 careers worksheet in which a compliance coordinator compares two filters' turbidity readings by median, IQR, and outlier test before filing a monthly report.
Grade 11 Worksheet
Windham Creek Dissolved Oxygen: Comparing Seasonal Spread
A grade 11 statistics worksheet comparing summer and winter dissolved-oxygen readings from a fictional creek using mean, median, IQR, standard deviation, and outliers.
Grade 9 Worksheet
Quillfen's Two Wells: Nitrate Box Plots and an Outlier
A grade 9 worksheet comparing eleven months of nitrate readings from two fictional wells using box plots, an outlier fence, and the mean against the median.
Grade 10 Worksheet
Calumet Heights Lead Service Lines: Reading the New Rule
A grade 10 worksheet on the fictional Calumet Heights system: students find a 90th-percentile lead reading, compare it to a tightening action level, and plan replacement.
Grade 11 Worksheet
Otterburn Plant Chlorine Residual: Comparing Shift Statistics
A grade 11 statistics worksheet comparing the center and spread of two shifts of chlorine-residual data at a fictional plant, with an outlier from a pump error.
Grade 12 Worksheet
Bexmoor Lead Sampling: The 90th Percentile Rule
A grade 12 statistics worksheet computing the median, mean, range, and the Lead and Copper Rule 90th percentile from a fictional utility's ten tap samples.
Math problem sets
Grade 11 Math problem set
Ellersby's Lead Samples: The 90th Percentile and the Action Level
A grade 11 statistics problem set where students rank a fictional system's lead samples, find the 90th percentile, and compare it to the current and 2027 action levels.
Grade 11 Math problem set
Two Intakes at Marden and Culliton: Turbidity Statistics
A grade 11 statistics set comparing a week of turbidity from two fictional intakes with mean, median, IQR, standard deviation, and an outlier test.
Grade 11 Math problem set
Deer Hollow Monitoring Wells: Box Plots, Outliers, and Nitrate
A grade 11 problem set where students build a box plot from fictional groundwater monitoring wells' nitrate data and decide how an outlier should be handled.
Projects
Grade 11 Project
Vireo Lake Plant: A Chlorine Residual Control-Chart Study
A four-session grade 11 statistics project building a control chart from a fictional plant's 20-day records and writing a compliance memo to a water board.