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Correlation

Correlation. Two variables: Which test?. X. Contingency analysis. Logistic regression. Y. Correlation Regression. t-test. Two variables: Which test?. X. Contingency analysis. Logistic regression. Y. Correlation Regression. t-test. Relationship Between Two Numerical Variables.

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Meaning of the sample correlation coefficient (r)

Meaning of the sample correlation coefficient (r). A measure of the closeness of linear relationship between two variables. r= ?x 1 x 2 / [(?x 1 2 )(?x 2 2 )] 1/2 Properties of r A pure number without units r between -1 and +1

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Do Now

Do Now. The ratio of men to women on a cruise is 6 to 8. If there are 168 people on the cruise, how many women are there?. More Difficult Proportions. 1) 2) . 3) 4) . 5) 6). Direct Variation. If two variables vary directly , their ratio is constant.

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Correlation

Meaning of the sample correlation coefficient (r)

Do Now