The Scientific Standard for Establishing Causality: Controlled Experiments
The scientific standard for establishing that one variable (X) causes another (Y) involves conducting a controlled experiment. In such an experiment, researchers intentionally change X while observing the resulting impact on Y, ensuring that other factors are held constant to confidently attribute the change in Y to the change in X.
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The Scientific Standard for Establishing Causality: Controlled Experiments
Which of the following best describes a challenge in establishing causality in economics?
What is a key reason why controlled experiments are rarely feasible in economics?
Which method can economists use to explore causal relationships when controlled experiments are not feasible?
Why is it difficult to establish causality in economics through experiments?
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Debating the Causes of Hockey Stick Growth: Institutions vs. Culture
Example of a Causal Statement in Economics
Natural Experiment
Confounding Variables in Scholarship Studies
Evaluating an Economic Causal Claim
Interpreting Policy Outcomes
Analyzing an Observed Economic Relationship
Critiquing an Economic Policy Claim
Evaluating a Causal Economic Statement
Economists often cannot use traditional controlled experiments to establish causality. Match each proposed economic study with the primary reason why such an experiment would be unfeasible or inappropriate.
Distinguishing Correlation from Causation
Challenges of Controlled Experiments in Economics
The Purpose of Causal Statements in Economics
Complexity of Economic Systems and Causal Claims
Limitations of Conventional Experiments in Economics
The Scientific Standard for Establishing Causality: Controlled Experiments
Methodology of Controlled Economic Experiments: Isolating Variables
Deductive Reasoning
Generating Hypotheses
Example of a Non-Testable Hypothesis
Example of a Hypothesis
Role of Hypothesis Testing in Theory Refinement
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The Scientific Standard for Establishing Causality: Controlled Experiments
A researcher is investigating the connection between the amount of time spent on a social media app and users' self-reported levels of happiness. The researcher starts with the general idea that excessive social media use might negatively affect well-being. Which of the following statements represents the most effective and scientifically testable hypothesis for an experiment on this topic?
The 'If-Then' Relationship between Theories and Hypotheses
Testing Competing Theories with Hypotheses
Characteristics of a Good Hypothesis
The Cyclical Process of Scientific Inquiry
Deriving a Hypothesis from the James-Lange Theory
Falsifiability and Confidence in Scientific Research
Requirement of a Hypothesis for Scientific Experiments
A-theoretical Hypothesis
Variable
Population
Which of the following statements best describes a scientific hypothesis?
When an empirical study's results fail to support a specific hypothesis, the broader theory from which that hypothesis was derived is automatically considered disproved.
A psychologist is investigating the relationship between physical activity and mental health. Using the scientific process shown in the image as a guide, match each part of their research process to its correct scientific component.
A psychologist is investigating the relationship between 'social support' and 'physiological stress'. Using the provided scientific method diagram as a guide, arrange the following steps in their correct logical sequence, starting from the broadest conceptual level and ending with the evaluation of that level.
A researcher is developing a study based on the theory that 'social support' buffers the effects of 'stress' on 'immune function'. Following the scientific process shown in the provided image, which of the following represents the most appropriately constructed 'hypothesis' for an empirical test of this theory?
A psychologist evaluates the results of an experiment that fail to support their specific prediction. Instead of discarding the broader theory, they decide to refine its assumptions for a follow-up study. This judgment is scientifically sound because, within the hypothetico-deductive method, the disconfirmation of a specific _____ does not logically necessitate the immediate rejection of the theory from which it was derived.
A(n) _____ is a specific prediction regarding the outcome of a particular scientific study.
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Analyze the relationships between components in the hypothetico-deductive method by matching each component of scientific inquiry to its correct description.
Evaluate the cyclical process of scientific inquiry. Arrange the steps of the hypothetico-deductive method in their correct logical order, starting from the source of the prediction to the ultimate refinement of knowledge.
Define the term 'hypothesis' and explain its role within the hypothetico-deductive method. What are hypotheses derived from, and what does it mean for a theory when a hypothesis derived from it is disconfirmed?
Based on the hypothetico-deductive method, explain why this study's outcome does not automatically disprove the psychologist's broader theory that chronic stress impairs spatial memory. What should the psychologist do next with their theory?
A psychology researcher wants to test the theory that high social support buffers against physiological stress. Apply the hypothetico-deductive method by writing a specific, testable hypothesis that could be evaluated in an empirical study.
The Scientific Standard for Establishing Causality: Controlled Experiments
A student notices that on days they drink a specific energy drink before studying, they feel more focused and perform better on quizzes. They conclude that this energy drink is an effective study aid that improves cognitive performance. From a scientific perspective, what is the primary flaw in this conclusion?
Learn After
Confounders in Causal Inference
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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.
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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?