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. So, the correlation coefficient is used to measure the strength of the relationship for the line of best fit.

Answer:

the correlation coefficient