How do multiple-regression designs address internal validity?

Ruling Out Third Variables with Multiple-Regression Designs—By measuring possible third variables and using multiple regression analysis, these third variables can be eliminated as explanations for the relationship between the key variables.

answer:

i think the answer is

1.create another line that intersects the segment.

step-by-step explanation:

this is because, when ever everyone writes when they want to do another part they draw a line threw the middle of the page and write under it.

everyone might not do that, but most people i know do.

for sharing, i hope i was .