Acceptance sampling:

may be either of a variable or attribute type, although attribute inspection is more common in the business environment.

may involve inspectors taking random samples $($or batches$)$ of finished products and measuring them against predetermined standards.

may involve inspectors taking random samples $($or batches$)$ of incoming raw materials and measuring them against predetermined standards.

is more economical than $100\%$ inspection.

All of these are true.