Survey Method- it's the most common type of study in psychology. It measures correlation. It's cheap and fast, it requires a variety of ransom samples, and it has a low-response rate.

Naturalistic Observation- it's basically watching subjects in their natural environment. You do not manipulate the environment.

Correlation Coefficient- it measures the amount of a relationship. It has a range from -1 to 1. The relationship gets weaker the closer you get to zero.

Case Studies- a detailed picture of one or a few subjects. Tells a story, and is only descriptive research. Doesn't give us correlation data.
Statistics- the recorded results from a study.
Mean, median, and mode
Mean- average
Median- middle number
Mode- most common number
Descriptive Statistics- describes sets of data
Other Measures of Liability
Range- distance from highest to lowest number
Standard Deviation- the variance of scores around the mean