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how can i tell if a scatter plot has a linear association
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To determine if a scatter plot has a linear association, you can follow these steps:
1. Look at the overall pattern of the data points on the scatter plot. If the points roughly form a straight line, then it is likely that there is a linear relationship between the variables.
2. Calculate the correlation coefficient between the two variables. A correlation coefficient close to 1 or -1 indicates a strong linear relationship, while a coefficient close to 0 indicates no linear relationship.
3. If you are unsure, you can also visually inspect the regression line on the scatter plot. If the regression line fits the data well and has a constant slope, then there is likely a linear association.
4. Additionally, you can conduct a linear regression analysis to confirm the relationship between the variables. If the regression analysis shows a significant relationship and a high R-squared value, then it is likely that there is a linear association.
By considering these factors, you can determine if a scatter plot has a linear association between the variables.