50 points and Brainliest!
How did sit-ins affect the civil rights movement? What does "sit-in" mean and how
effective was it, and why was it that effective?

I honestly agree with the first person response. They did a great good explaining things.

China’s policy is more effective.

Explanation:

got it right

ed

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.