NUR 80A/B Lecture 8: Pearson's r and the Chi Squared Test
13 Dec 2011
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Winter week 8 - inferential statistics: pearson"s r and the chi. Indicates direction and magnitude of relationship between the two variables. Positive correlation = variables change in the same direction or . Negative correlation = variables change in opposite directions or . The correlation coefficient acts as its own test statistic. The r value calculated by spss is the test statistic (obtained value) As usual, you can compare the obtained r to the critical values for r at the appropriate df listed in table b4, appendix b of salkind. All of the statistical tests we have discussed so far are based on certain characteristics about the data, e. g. level of measurement of the dependent variable is interval or ratio level. Statistical tests that follow these assumptions are called parametric statistics. If the assumptions are not met in our data we can use nonparametric statistics that don"t follow the same rules - also called distribution-free statistics.
