Grade 9 · From USB to Field System: ESP32 water quality

Reliability and calibration

Follow the student handout to build, test and document this stage of the water-quality system.

Prepared lesson material. Start this task when your teacher introduces it; it is not currently assigned homework.

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3 pages · Use the handout for the complete instructions, examples and response spaces.

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For diagrams, visual examples and the full layout, open the handout above.

Lesson 12: Reliability, Accuracy, and Calibration

Data analysis and claim-evidence-reasoning

Grade 9 MYP Design | From USB to Field System

Name: __________________

Class / team: __________________

Date: __________________

Today’s goals • Distinguish precision and accuracy. • Calculate mean and range. • Identify noise, drift, and outliers. • State cautious conclusions.

Scenario	Precise?	Accurate?	Reason
Readings cluster tightly but are all far from the reference
Readings are spread out around the reference
Readings cluster tightly around the reference
No reference value is available

Use one set of repeated readings from your test.

Reading 1	Reading 2	Reading 3	Reading 4	Reading 5	Mean	Range

Mean = sum of readings ÷ number of readings. Range = maximum − minimum.

☐ Time or sample is on the x-axis.

☐ Sensor value and unit are on the y-axis.

☐ Title states what is being compared.

☐ Legend is included if more than one series is shown.

☐ Caption states test conditions and calibration status.

Identify one unusual reading. Is it an outlier? What evidence or rule supports your decision? Do not delete it without explanation.

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Claim:

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Evidence:

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Reasoning:

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Limitations and calibration status:

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Does repeatability prove accuracy? Explain.

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