Question

what did galton use to calculate how strong the relationship was for the line of best fit?
× a bell shaped curve
○ forensics
○ genetic testing
○ the correlation coefficient

Explanation:

The correlation coefficient measures the strength and direction of a linear relationship between two variables. A bell - shaped curve (normal distribution) is a probability distribution. Forensics is related to legal investigations. Genetic testing is for analyzing genes.

Answer:

the correlation coefficient