Question

identify the type of sampling used: random, systematic, convenience, stratified, or cluster. to estimate the percentage of defects in a recent manufacturing batch, a quality control manager at sony selects every 15th music cd that comes off the assembly line starting with the fourth unit until she obtains a sample of 40 music cds. which type of sampling is used? a. systematic b. stratified c. convenience d. random e. cluster

Explanation:

Systematic sampling involves selecting every \( n \)-th element from a population. Here, the quality control manager selects every 15th CD starting from the 4th, which fits the systematic sampling method. Random sampling would involve random selection without a fixed interval, stratified sampling divides the population into groups first, convenience sampling uses easily accessible elements, and cluster sampling divides into clusters and samples clusters. Since there's a fixed interval (every 15th) here, it's systematic.

Answer:

A. Systematic