Research Methods

Research Methods
Psychologists use many different methods for conducting research. Each method has advantages and disadvantages that make it suitable for certain situations and unsuitable for others.

Descriptive or Correlational Research Methods

Case studies, surveys, naturalistic observation, and laboratory observation are examples of descriptive orcorrelational research methods. Using these methods, researchers can describe different events, experiences, or behaviors and look for links between them. However, these methods do not enable researchers to determine causes of behavior.
Remember: correlation is not the same as causation. Two factors may be related without one causing the other to occur. Often, a third factor explains the correlation.
Example: A psychologist uses the survey method to study the relationship between balding and length of marriage. He finds that length of marriage correlates with baldness. However, he can’t infer from this that being bald causes people to stay married longer. Instead, a third factor explains the correlation: both balding and long marriages are associated with old age.
Measuring Correlation
A correlation coefficient measures the strength of the relationship between two variables. A correlation coefficient is always a number between –1 and +1. The sign (+ or –) of a correlation coefficient indicates the nature of the relationship between the variables.
A positive correlation (+) means that as one variable increases, the other does too.
Example: The more years of education a person receives, the higher his or her yearly income is.
negative correlation (–) means that when one variable increases, the other one decreases.
Example: The more hours a high school student works during the week, the fewer A’s he or she gets in class.
The higher the correlation coefficient, the stronger the correlation. A +0.9 or a –0.9 indicates a very strong correlation; a +0.1 or a –0.1 indicates a very weak correlation. A correlation of 0 means that no relationship exists between two variables.
Common correlational research methods include case studies, surveys, naturalistic observation, and laboratory observation.
Case Studies
In a case study, a researcher studies a subject in depth. The researcher collects data about the subject through interviews, direct observation, psychological testing, or examination of documents and records about the subject.