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A factory manufactures bolts. One of its employees, working in the quality control department, checks the first 20 bolts manufactured in a day for possible

A factory manufactures bolts. One of its employees, working in the quality control department, checks the first 20 bolts manufactured in a day for possible defects.

This is what type of sampling?

Stratified sampling
Systematic sampling
Voluntary response sampling
Convenience sampling

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