Empirical evidence

Empirical evidence consists of observations or measurements used to support or challenge claims about the world. It is distinguished from support based solely on logic, authority, or speculation.

Observation: The act or result of noticing and recording phenomena through the senses or instruments. Observations supply the recorded particulars from which empirical claims are assessed.
Scientific method: A systematic approach to investigating questions through observation, testing, and revision. Empirical evidence is central to this broader approach to inquiry.
Randomized controlled trial: An experiment that randomly assigns participants to treatment and comparison groups. Random assignment helps test causal claims by balancing confounding factors.
A priori knowledge: Knowledge or justification claimed to be independent of experience. It contrasts with support that depends on observation or measurement.
Measurement: The assignment of numbers or categories to properties according to defined procedures. Measurements make many observations comparable, while depending on instruments and conventions.
Hypothesis: A proposed explanation or prediction that can be assessed against evidence. A hypothesis makes claims that observations can support or challenge.
Observational study: A study that records exposures and outcomes without assigning participants to interventions. It provides evidence when controlled intervention is impractical or unethical.
Deductive reasoning: Reasoning in which a conclusion follows necessarily from stated premises and rules. Deduction establishes what follows from premises, not whether those premises match observed reality.
Operationalization: The process of defining how an abstract concept will be observed or measured. It connects claims about concepts such as intelligence to measurable indicators.
Inference: A conclusion drawn from premises, evidence, or patterns in available information. Evidence does not speak by itself; conclusions require inferential steps.

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