Psychology 2080A/B Lecture Notes - Lecture 3: Scatter Plot, Joint Probability Distribution, Standard Score

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The scatter diagram: a bivariate distribution shows an individual"s score on two variables at the same time, a scatter diagram is a picture of the relationship between 2 variables, allows for visual inspection of data, a scatter diagram. The circled point shows a person who had a score of 21 on x and 14 on y. Is designed to examine a linear relationship between 2 variables: the correlation coefficient is a statistic that depicts the direction and magnitude of a relationship between 2 variables. The best-fitting line: the best fitting (regression) line through a series of data points. Testing the statistical significance of a correlation coefficient. Statistical significance refers to whether a given finding was or was not more likely to occur than chance: begin with a null hypothesis that there is no meaningful relationship. If a relationship is found to exist, the null hypothesis is rejected: correlation coefficient significance is assessed using a t distribution.

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