PSY 313 Chapter Notes - Chapter 12: Scatter Plot, Pearson Product-Moment Correlation Coefficient, Level Of Measurement
Document Summary
Goals- to examine and describe the associations & relationships between variables. Want to establish that a relationship exists and describe the nature of the relationship -- does not explain the relationship. Data- at least 1 measurement for each variable, usually from the same person. Experimental research- demonstrate a cause and effect relationship between 2 variables, involves the manipulation of variables. Can be presented in a table or scatter plot, which can show the characteristics of the relationship between the variables. Correlation/ correlation coefficient- measures and describes the relationship. Positive relationship- x and y change in the same direction. Negative relationship- x and y change in opposite directions. The line slopes down to the right on a scatter plot. Linear relationship- the data plots tend to cluster around a straight line. Pearson correlation- used to measure linear relationships when variables are numerical scores from interval/ratio scales. Monotonic relationship- consistently one directional in either direction.
