Statistics and Data Science Education / Scatterplot Regression Defense

Adapt the same algorithm to a changed contract without throwing away the original reasoning model.

Step 4 of 5 80% Complete

Checkpoint 4

Mutation Task

This is the first transfer test. The student is no longer explaining the original algorithm; they must adapt it when the environment changes.

Enabled modules: Hotspot, Trace, Mutation, Repair

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Mutation Prompt

Modify your R workflow so it safely removes incomplete rows before calling lm() or drawing the scatterplot.

Keep the original modeling logic, but change the data contract safely. A strong response makes the smallest possible fix without resetting the design.

description scatterplot_regression_defense_mutation.R

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Submit Mutation send

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Technical Log

[14:02:11]INITSandbox environment ready.

[14:02:15]WARNLint: Missing type validation.

[14:02:18]FAILTest null_input_edge failed.

LAST OUTPUT:

Error in lm.fit(x, y, offset = offset, singular.ok = singular.ok, ...) : NA/NaN/Inf in "y"

Student Response

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Describe the exact defensive change you would make before moving on.

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Why this matters

Students who only memorized the original answer often fail here. Students who understand the data contract usually clean incomplete rows before fitting or plotting.