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Statistics - Smoking and Productivity

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How to show a relationship between smoking and productivity, using a correlation coefficient. What would a visual of that formula as a scatterplot diagram look like for smoking and worker productivity.

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The relationship between smoking and productivity is determined. A complete, neat and step-by-step solution is provided in the attached file.

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How to show a relationship between smoking and productivity, using a correlation coefficient. What would a visual of that formula as a scatter plot diagram look like for smoking and worker productivity.
There may not be single correlation ...

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