Research methods Revision Notes

Observations: Naturalistic vs. Controlled

Observations involve systematically watching and recording behaviour. Naturalistic observation takes place in a participant's natural environment, allowing for high ecological validity because behaviour is likely to be authentic. However, there is less control over extraneous variables, making it harder to establish cause-and-effect and potentially increasing observer bias. Controlled observation occurs in a structured environment, such as a laboratory. This provides greater control over variables, making it easier to replicate and identify patterns. However, the artificial setting can lead to lower ecological validity, as participant behaviour might not be typical of their actions in real life. Both types can be overt (participants know they are being watched) or covert (participants are unaware), with ethical implications for the latter.

Case Studies: In-depth Research

Case studies are detailed investigations of a single individual, group, or event. They often involve gathering information from a variety of sources, such as interviews, observations, personal documents, and psychological tests, to build a rich, qualitative picture. Case studies are excellent for studying unique or rare phenomena that cannot be investigated using other methods. They provide rich, in-depth data and allow researchers to explore complex interactions. A significant limitation is that findings from a single case are often difficult to generalise to a wider population. The subjectivity involved in interpreting qualitative data also means there's a risk of researcher bias influencing the findings, potentially affecting reliability and validity.

Correlations: Relationships Between Variables

Correlations are a statistical method used to identify the strength and direction of a relationship between two co-variables. A positive correlation means that as one variable increases, the other variable also increases (e.g., height and weight). A negative correlation means that as one variable increases, the other decreases (e.g., hours watching TV and academic grades). A zero correlation indicates no relationship. It is crucial to remember that correlation does not imply causation. A strong correlation only suggests a relationship exists; it does not mean one variable causes the other, because a third, unmeasured variable (a confounding variable) could be responsible for the observed relationship. This method is useful for identifying potential links for further research and can be used when it's unethical or impractical to manipulate variables.

Strengths and Weaknesses of Each Method

Observations offer high ecological validity (naturalistic) or high control (controlled). However, they can suffer from observer bias and ethical issues if covert. Case studies provide rich, in-depth data, especially for rare cases, but lack generalisability and are prone to researcher bias. Correlations can identify relationships between variables, are useful for preliminary research, and help predict trends. The main weakness of correlations is that they cannot establish cause and effect, leading to potential misinterpretation where a third variable might be responsible for the observed relationship. Each method has specific applications and drawbacks that psychologists must consider when designing studies.