Question

to estimate the percentage of defects in a recent manufacturing batch, a quality control manager at ibm selects every 14th computer that comes off the assembly line starting with the eighth until she obtains a sample of 150 computers. what type of sampling is used? a. cluster b. convenience c. systematic d. simple random e. stratified

Explanation:

• Cluster Sampling: Involves dividing the population into clusters and sampling entire clusters. Not applicable here as we're not sampling clusters.
• Convenience Sampling: Uses easily accessible subjects. Here, a fixed interval is used, not convenience.
• Systematic Sampling: Selects every \( k \)-th element after a random start. Here, starting at the 8th and selecting every 14th computer fits this ( \( k = 14 \), start at 8).
• Simple Random Sampling: Each element has an equal chance, and selection is random without a fixed interval. Not the case here.
• Stratified Sampling: Divides the population into strata and samples from each. Not applicable here.

Answer:

C. Systematic