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10 Cards in this Set
- Front
- Back
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Response Variable
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measures an outcome of a study
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explanatory variable
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attempts to explain the observed outcomes.
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who would you create a scatterplot
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1. a scatterplot shows relationships between two quantatative variables.
2. the explanatory variable is on the x axis 3. the response variable is on the y axis. |
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What would a scatterplot look like if there is a positive association?
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the slope of the best fit line is positive.
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What would a scatterplot look like if there is a negative association?
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the slope of the best fit line is negative.
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What is the strength of a scatterplot?
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measures how close together the observations are.
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How do you identify an outlier within a scatterplot?
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if it lies outside the overall pattern of the graph, it is an outlier.
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Correlation,(r) always falls within what two values?
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-1 and 1
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Interpret the meaning of the following
r = -.9 r = 0 r = .8 |
r = -.9 means that there is a strong negative assiciation
r = 0 means that there is no association r = .8 means that there is a strong posiitive association. |
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What is a residual value and how do you calculate it?
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the difference between an observed value of the reponse variable and the predicted value from the regression line.
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