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

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

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

testing every fiftieth light bulb in the production line

Answer 1

To determine the percentage of defective light bulbs in the production line, the sampling method that would most likely lead to a valid inference is:

testing every fiftieth light bulb in the production line.

This method is a systematic random sampling technique, which ensures that the sample is spread throughout the entire production line. This helps minimize bias and provides a more accurate representation of the overall quality of the light bulbs being produced.

The other options may introduce bias, as they involve only testing a certain segment of the production line (e.g., the first or last bulbs tested) or testing bulbs that have already been evaluated.