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?(1 point)

Question

Responses

testing every fiftieth light bulb in the production line
testing every fiftieth light bulb in the production line

testing the last 4,000 bulbs in the production line
testing the last 4,000 bulbs in the production line

retesting 100 light bulbs that have already been tested
retesting 100 light bulbs that have already been tested

testing the first 2,000 light bulbs in the production line
testing the first 2,000 light bulbs in the production line

Answer 1

The most appropriate sampling method that would likely lead to a valid inference about the percentage of defective light bulbs in the production line is:

Testing every fiftieth light bulb in the production line.

This method ensures a random sample from different points in the production process, reducing biases that might arise from testing just a specific segment (like the first 2,000 or last 4,000 bulbs) or retesting bulbs that have already been tested. It provides a more representative sample of the entire production line, allowing for a more accurate estimation of the percentage of defective light bulbs.