Quality control manager wants to determine the percentage of defective lightbulbs in the production line which of the following sample methods would most likely lead to a valid inference Would it be testing the first 2000 lightbulbs in the production line or testing the last 4000 bulbs in the production line or retesting 100 lightbulbs that have already been tested or testing every fiftieth lightbulb and the production line
1 answer
The most valid sample method for determining the percentage of defective lightbulbs in the production line would be testing every fiftieth lightbulb in the production line. This method ensures that a random and representative sample of lightbulbs is selected for testing, which would provide the most accurate inference about the percentage of defective lightbulbs in the entire production line. Testing the first 2000 lightbulbs or the last 4000 lightbulbs may not provide a representative sample, as there could be variations in the production process over time. Retesting 100 lightbulbs that have already been tested may not provide new information about the overall percentage of defective lightbulbs in the production line.