Question

Which of the following can be used to show a cause-and-effect relationship between two variables?

A census
An experiment
An observational study
A sample survey
A cross-sectional survey

Answer 1

An experiment

Explanation:

Cause and effect happen only when you are directly involved with the independent variable, changing it. This causes the dependent variable to change in the long run. The experiment is the only option that includes changing variables instead of just observing them.

PS The other answer is also correct it was just a different type of answer choice.

Answer 2

A controlled experiment.