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# scatter - LECTURE UNIT 6 Understanding Relationships Among...

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LECTURE UNIT 6 Understanding Relationships Among Variables Scatterplots and correlation Fit a straight line to bivariate data

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Examples Latin’s resurgence: high correlation with SAT scores Test prep. courses: are claims of score improvement bogus? Quarterback ratings: combining several variables to compute 1 number that measures performance Your predicted GPA when you applied to NCSU
6.1 Basic Terminology Univariate data : 1 variable is measured on each sample unit or population unit (lecture unit 2) e.g. height of each student in a sample Bivariate data : 2 variables are measured on each sample unit or population unit e.g. height and GPA of each student in a sample; ( caution: data from 2 separate samples is not bivariate data)

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Basic Terminology (cont.) Multivariate data: several variables are measured on each unit in a sample or population e.g. 1) height, GPA, and distance between NCSU and hometown; Focus on bivariate data in lecture unit 6
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scatter - LECTURE UNIT 6 Understanding Relationships Among...

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