Pysch102: Introductory Psychology
Research Methods in Psychology (3)
Why study psychology scientifically?
-our intuitions are often biased
1) Descriptive Research:
-case study, survey research, naturalisitc observation
-we know our variables and want to describe them
-watching what happens naturally
-in a public setting, do happy people tend to be grouped with other happy people, and sad people with
other sad people?
2) Correlational Research:
-accessing relationship between 2 or more variables
-is a persons happiness positively correlated with the happiness of his/her roommate?
-using correlations in twins to measure heritability of a trait
-ex: is depression related to low self-esteem?
-can range from -1 to +1
-magnitude of value, shows you the strength of the relationship
-0 indicates no relationship between the variables
-positive relationship means they move in the same direction
-a negative correlation means
-you can test many variables at the same time
-ex: does persistence relate to other outcomes in addition to GPA?
-lower numbers(.24) is a higher correlation than (.70)
-.18 better predictor than .45
Statistical significance: the statistics that went into calculating the magnitude of the relationship
-less than 5% probability that the difference between conditions happened by chance
-denoted statistically as p