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To estimate the percentage of defects in a recent manufacturing batch, a quality specialist working for Apple looks at the 8th iPod that came off

To estimate the percentage of defects in a recent manufacturing batch, a quality specialist working for Apple looks at the 8th iPod that came off the assembly line and every 18th iPod thereafter until a sample of 70 Pods were obtained. Which type of sampling method was used? 

A. Convenience 

B. Simple Random 

C. Systematic 

D. Cluster 

E. Stratified Random

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