1. In the total process of investigating a question, the very first thing a scientist does is state the problem.
2. A scientist completes an experiment and then forms a hypothesis on the basis of the results of the experiment.
3. In an experiment, the scientist should always collect as large an amount of data as is humanly possible.
4. Even a specialist in a field may not be capable of picking a sample that is truly representative, so it is better to choose a random sample.