Regression

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What is regression?

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Regression is a statistical method used to determine the relationship between a dependent variable and one or more independent variables.

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What does a correlation coefficient (r) of 1 indicate?

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A correlation coefficient (r) of 1 indicates a perfect positive linear relationship between two variables.

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What does a correlation coefficient (r) of -1 indicate?

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A correlation coefficient (r) of -1 indicates a perfect negative linear relationship between two variables.

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What does a correlation coefficient (r) of 0 indicate?

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A correlation coefficient (r) of 0 indicates no linear relationship between the variables.

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What is a scatter plot?

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A scatter plot is a graphical representation of two variables, showing the relationship between them using points on a Cartesian plane.

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What does a strong positive correlation look like on a scatter plot?

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A strong positive correlation on a scatter plot appears as points that closely follow an upward trend.

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What does a strong negative correlation look like on a scatter plot?

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A strong negative correlation on a scatter plot appears as points that closely follow a downward trend.

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What is the formula for the correlation coefficient (r)?

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What is the purpose of regression analysis?

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The purpose of regression analysis is to predict the value of a dependent variable based on the value(s) of one or more independent variables.

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What is the difference between simple and multiple regression?

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Simple regression involves one independent variable, while multiple regression involves two or more independent variables.