Discussion
The decision based on inspection by variables is ................... reliable than by attributes.
Answer: C
Decisions based on inspection by variables are more reliable than those by attributes.
Inspection by variables measures the actual value of a characteristic, such as a diameter in millimetres, while inspection by attributes only records whether each item is good or defective. A measurement carries far more information than a pass-or-fail mark, so for the same sample size variables inspection gives a more reliable decision, or the same reliability with a smaller sample.
'Less' reverses the relationship. 'More than' and 'less than' do not fit the sentence, which already contains 'than'.
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