Confounders in Causal Inference

Agricultural Experiment as an Example of a Conventional Experiment

Gregor Mendel's Pea Plant Experiments as a Foundational Example of Controlled Experiments

Limitations of Conventional Experiments in Economics

A city government launches a large-scale 'Shop Local' advertising campaign to boost sales at small businesses. Six months later, they observe a 15% increase in average revenue for these businesses and conclude the campaign was the direct cause of the increase. From the perspective of a controlled experiment, what is the primary reason this conclusion is potentially flawed?

Evaluating a User Engagement Experiment

Critiquing an Experimental Design

Designing an E-commerce Experiment

To establish that a change in one variable causes a change in another, it is sufficient for a researcher to systematically alter the first variable and then observe a consistent change in the second variable.

Match each research scenario with the principle of experimental design it best illustrates or violates.

A researcher wants to test if a new fertilizer increases tomato yield. They prepare two identical fields of tomatoes, but only apply the new fertilizer to the first field. In this setup, the second field, which does not receive the new fertilizer, serves as the ____ ____, allowing the researcher to isolate the fertilizer's true effect from other factors like weather.

Scientific vs. Everyday Meaning of 'Experiment'

Evaluating a Corporate Wellness Program

A researcher wants to scientifically determine if a new teaching method improves student test scores. Arrange the following steps into the correct logical order for conducting a controlled experiment to test this.

A software company wants to determine if changing the color of its 'Sign Up' button from blue to green causes more users to create an account. Which of the following methods best represents a controlled experiment to establish this causal link?