12. All data points falling along a straight line is called:*2 pointsLinear relationshipNon linear relationshipResidualScatter diagram

To determine the correct answer to the question about data points falling along a straight line, let's analyze the options provided.

Analysis of Options

1. Linear relationship: This refers to a relationship in which the data points can be represented by a straight line. If all data points fall on a straight line, this is a clear indication of a linear relationship.

2. Non-linear relationship: This indicates that the data points do not form a straight line and instead could take various curved or other shapes. This does not apply here.

3. Residual: Residuals refer to the difference between observed and predicted values in a regression analysis and are not applicable to the description of the relationship between data points.

4. Scatter diagram: A scatter diagram is a graphical representation of data points on a two-dimensional grid; however, the term does not specifically denote the nature of the relationship (linear or non-linear) between the points.

Conclusion

Given this analysis, the option that best describes the data points falling along a straight line is clearly the Linear relationship.

Final Answer

Linear relationship