A laptop manufacturer wants to advertise their claim that the average battery life of their laptop is more than 10 hours, so it tests a subset of laptops. Based on this test, the manufacturer was able to conclude that the laptop battery lasts longer than 10 hours on a single charge. This is an example of:

Group of answer choices

1. numerical measures.

2. inferential statistics.

3. descriptive statistics.

4. quantitative models