PSYC 2030 Lecture Notes - Lecture 6: Descriptive Statistics, X&Y

• School: York University
• Department: Psychology
• Course: PSYC 2030
• Professor: Rebecca Jubis

Document Summary

A positive relationship states that if one variable increases then the corresponding variable also increases and vice versa for the negative variable. Pearson r unless otherwise indicated it is appropriate to use this if there i an interval or ratio scale. It is a descriptive statistic that describe the characteristics of the data coefficient describes the relationship of the two variables. Restriction of range is when only a narrow range of scores are used for both variables and this misrepresents the correlation and reduces the ability to make predictions. An outlier is a score that is extremely different form the others in the data set and can distort the correlation coefficient. This involves making predictions on the basis of correlational data. Knowing the size of the correlation ad a value for (cid:494)x(cid:495)(cid:523)predictor variable(cid:524), it is possible to predict the value from (cid:494)y(cid:495)(cid:523)criterion variable(cid:524) Minimizes the vertical distances in all of the dots.