alleryA lab balance always reads 5 g too high but gives steady readings. How is it best described?
AValid and reliable
BReliable but not valid
CValid but not reliable
DNeither reliable nor valid
Answer & Solution
Correct answer: B. Reliable but not valid
1. Steady readings mean the instrument is consistent, so reliable.
2. A fixed error means it does not measure the true mass, so it lacks validity.
3. Like a wrongly marked ruler, it gives the same wrong measurement every time.
_Source: Wikipedia, Educational assessment, Validity_
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