Question: A manufacturing unit produces 2000 electric bulbs every month. Samples of the bulbs are to be tested for any manufacturing defects. What is the best sampling methodology for testing?
A ) cluster sampling B ) random sampling C ) systematic sampling D ) full population
Steps to derive
1 Testing of entire population is not practical due to limitations in cost and time.
2 Cluster sampling will not provide information on a particular batch and may not reflect the true stage of the manufacturing process.
3 Random sampling is possible, but is a continuous process.
