Demand characteristics refer to clues or signals in an experimental setting that hint to participants about the experimenter's expectations, leading them to behave in a certain way to match these expectations, potentially biasing the results.| Simply Psychology
A controlled experiment aims to demonstrate causation between variables by manipulating an independent variable while controlling all other factors that could influence the results. Its purpose is to show that changes in one variable (the independent variable) directly cause changes in another variable (the dependent variable).| Simply Psychology