Question

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1. correlation can only be used when the form of the scatterplot is ______.

Explanation:

Correlation measures the strength and direction of a linear relationship between two variables. A scatterplot with a linear form (points roughly following a straight - line pattern) is necessary for correlation analysis. If the scatterplot has a non - linear form (e.g., curved), correlation (which is designed for linear relationships) is not appropriate.

Answer:

linear