Aaron wants to study the association between sleep deprivation and the number of hours spent on computer every day. He is not keen to establish causation, but would like to determine whether and how the increase or decrease in one variable is associated with the increase or decrease in the other variable. Which of the following research methods is likely to be most effective for Aaron’s study?
1. experimental research
2. correlational research
3. case study
4. survey

The answer is 2. correlational research.

Explanation:

Correlational research intends to find the relatioship between two or more variables in a study. For example, a news article titled "Cigarette smokers live ten years less on average" is likely based on a correlational study: the researchers found out that cigarette consumption is related to life expectancy.

It's important to recognise that correlation is not the same as causation. In other words, a relationship between variables does not imply there is a direct cause-effect relationship.

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