On a true track system, E-3 means that the test strip in the machine is expired, oxidized, used, or defective.
Replace strip and try again.
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if you meant by absolute error, then yes.
The true score and the error score :) A+
The sampling error is the error one gets from observing a sample instead of the whole population. The bigger it is, the less faith you should have that your sample represents the true value in the population. If it is zero, your sample is VERY representative of the population and you can trust that your result is true of the population.
The absolute error is 0.1 inch.
True