To estimate the percentage of defects in a recent manufacturing batch, a quality control manager at IBM selects every 14 th computer that comes off the
assembly line starting with the third until she obtains a sample of 150 computers.
What type of sampling is used?
A. Systematic 1.4 .11
B. Convenience
C. Stratified
D. Simple random
E. Cluster

The sampling method used here is systematic sampling. This technique involves selecting individuals based on a fixed interval, which in this case is every 14th computer starting from the third one. The systematic approach helps ensure that the sample is evenly distributed across the manufacturing batch, minimizing bias.

In practical terms, systematic sampling can be very efficient, especially in quality control situations like this one. It allows managers to quickly gather data without the need for random number generators or complex processes. Just imagine a quality control manager ready to spot trends and discrepancies from an assembly line with a simple, rhythmic count!