A quality control manager wants to determine the percentage of defective light bulbs in the production line. Which of the following sampling methods would most likely lead to a valid inference?
testing the first 2,000 light bulbs in the production line
retesting 100 light bulbs that have already been tested
testing the last 4,000 bulbs in the production line
testing every fiftieth light bulb in the production line
1 answer
Testing every fiftieth light bulb in the production line would most likely lead to a valid inference as it is a form of systematic random sampling. It ensures that every part of the production line has an equal opportunity to be represented in the sample, reducing the risk of bias and providing a representative sample. The other methods may be biased towards certain parts of the production line or may not be representative of the entire batch.