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Error, Uncertainty and Reliability
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Grade Level
Grade 8
8.8 Error, Uncertainty and Reliability
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A student wants to compare two distance sensors. They test Sensor A on a matte white wall and Sensor B on a shiny metal surface. Why is this comparison unreliable?
A
Different surfaces only affect random error, not the mean.
B
The surface type is a confounding variable; different reflectivity can systematically affect sensor readings.
C
Using two sensors automatically makes results reliable.
D
Reliability is the same as having two materials.
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