# Statistics Ch 4

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 Author: firefly501 ID: 137595 Filename: Statistics Ch 4 Updated: 2012-02-25 11:58:27 Tags: statistics Folders: Description: Scatterplots and Correlation Relationship between two variables Show Answers:

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1. Scatterplots
One axis represents each variable, data plotted as points
2. Response /Dependent variable
measures or records the outcome (y-axis)
3. Explanatory /Independent variable
explains changes in the response variable (x-axis)
4. Form
linear, non-linear, no relationship, curved, clustered
5. Direction
positive, negative, no direction
6. Strength
how much scatter around the main form
7. Outliers
deviations from the main pattern
8. Correlation
• Correlation coefficient (r) - a measure of the direction and strength of a relationship. It is
• calculated using the mean and the standard deviation of both the x and y variables.

• r ranges from -1 to +1
• When variability in one or both variables decreases, the correlation coefficient gets
• stronger (closer to +1 or −1).
• Correlations are calculated using means and standard deviations and thus are NOT
• resistant to outliers.

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