SDS 306 Lecture Notes - Lecture 15: Extrapolation, Regression Analysis
16 Feb 2017
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Document Summary
If the corr. is significant: you can infer that is not zero. Tv watching and age are associated in the population of children between the ages of 5 and 10. If it is not significant: you cannot make that inference. Considerations in correlational research: effect of outliers on correlation. Two types of outliers for bivariate data: in-line: fall in the same pattern as the rest of the data. Tend to artificially inflate r: off-line fall outside of the pattern of the rest of the data. Restricted range : data in which scores are confined to a narrow range of the possible scores on a measure. Having a restricted range artificially lowers correlations: below what they would be if the full range of scores were present. The goal is to: develop a regression equation to predict one var. from one or more other var. "s, correlation measures association. Simple regression (bivariate: predict one var. from another var.
