IPS6eCh02_2bb

IPS6eCh02_2bb - Looking at Data Relationships Correlation...

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Looking at Data - Relationships   Correlation IPS Chapter 2.2

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Objectives (IPS Chapter 2.2) Correlation The correlation coefficient “r” r does not distinguish between x and y r has no units of measurement r ranges from -1 to +1 Influential points
The correlation coefficient "r" The correlation coefficient is a measure of the direction and strength of a linear relationship. It is calculated using the mean and the standard deviation of both the x and y variables. Correlation can only be used to describe quantitative variables. Categorical variables don’t have means and standard deviations.

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The correlation coefficient "r" Time to swim: x = 35, s x = 0.7 Pulse rate: y = 140 s y = 9.5
involves finding z, the standardized score we used when working with the normal distribution. You DON'T want to do this by hand. Make sure you learn how to use

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IPS6eCh02_2bb - Looking at Data Relationships Correlation...

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