The main crew of an office building wants to estimate how many of the 20,000 lights in their 80-story building need a new light bulb. Which of the following is a random sample of lights to be inspected?
To obtain a random sample of lights to be inspected, the main crew should ensure that each light has an equal chance of being selected. This can be achieved by using a random number generator to select lights from different floors and areas of the building.
Therefore, the following is an example of a random sample of lights to be inspected:
- Selecting 100 lights by randomly choosing 1 light from each floor of the building
- Using a systematic sampling method to select lights at regular intervals throughout the building
- Randomly selecting lights from different areas of the building, such as offices, hallways, and common areas
By using random sampling methods like these, the main crew can obtain an unbiased estimate of the number of lights that need a new light bulb in the building.