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Chapter 1: Problem 34

What is the difference between a hypothesis and a theory in science?

Short Answer

Expert verified
A hypothesis is a testable, tentative explanation, while a theory is a substantiated explanation backed by evidence.

Step by step solution

01

Define a Hypothesis

A hypothesis is a proposed explanation for a phenomenon. It is a starting point for further investigation and must be testable. Hypotheses are often formulated as statements that can be proven true or false through experimentation and observation.
02

Define a Theory

A theory is a well-substantiated explanation of some aspect of the natural world that has been repeatedly confirmed through observation and experimentation. Theories are supported by a large body of evidence and provide a framework for understanding certain phenomena.
03

Compare Hypothesis and Theory

The main difference between a hypothesis and a theory is that a hypothesis is a tentative explanation that is testable and falsifiable, whereas a theory is a thoroughly tested and confirmed explanation for observations or phenomena. A hypothesis can become a theory after significant evidence supports it and it withstands extensive testing.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

scientific explanation
In science, a scientific explanation is a reasoned argument or statement explaining a phenomenon based on empirical evidence. The purpose is to provide a logical and reliable description of why things happen.
Scientific explanations use data collected from experiments, observations, and research.
They must be clear, precise, and consistent with existing scientific knowledge. Examples include explaining the orbits of planets with Newton's laws or describing the structure of DNA.
  • Data-Based: They rely on data and observations.
  • Logical: They follow a logical sequence of thought.
  • Consistent: They must align with established scientific knowledge.
Scientific explanations are fundamental in advancing our understanding of the world, as they help us make sense of complex natural phenomena.
testable hypothesis
A testable hypothesis is a predictive statement that can be proven true or false through experimentation and observation. It is an essential part of the scientific method and serves as a starting point for scientific investigations.
  • Predictions: A hypothesis predicts what might happen.
  • Falsifiable: It must be possible to test it and prove it false.
  • Specific: It should be clear and focused on a particular aspect of the phenomenon.
For example, if you hypothesize that plants grow faster under blue light than red light, you can design an experiment to test this by growing plants under both types of light and measuring their growth.
An effective hypothesis guides the research study, helping scientists identify what variables to manipulate and measure. It is crucial for developing scientific knowledge and advancing theories.
scientific theory
A scientific theory is a well-established explanation that is supported by a large body of evidence accumulated over time. Unlike a hypothesis, a theory has undergone extensive testing and validation through various scientific methods.
  • Well-Substantiated: A theory is supported by significant evidence.
  • Predictive: It can predict future occurrences or observations.
  • Consistent: It must be coherent with existing knowledge and confirmed by multiple independent sources.
Theories offer comprehensive insights into the workings of the natural world. Famous examples include the theory of evolution, the theory of relativity, and the germ theory of disease.
Theories are not static; they evolve as new evidence emerges. They help form the backbone of scientific knowledge, guiding further research and enhancing our understanding of complex systems.

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Most popular questions from this chapter

Any explanation of a phenomenon that includes a supernatural influence is not scientific because a. it does not have a hypothesis. b. it is wrong. c. people who believe in the supernatural are not credible. d. science is the study of the natural world.

A light-year is a unit of distance most comparable to the distance from Earth to the a. Moon. b. Sun. c. outer Solar System. d. nearest star. e. nearest galaxy.

Imagine that you have become a biologist, studying rats in Indonesia. Most of the time, Indonesian rats maintain a constant population. Every half century, however, these rats suddenly begin to multiply exponentially! Then the population crashes back to the constant level. Sketch a graph that shows the rat population over two of these episodes.

The Sun is part of a. the Solar System. b. the Milky Way Galaxy. c. the universe. d. all of the above

Some people have proposed the theory that Earth was visited by extraterrestrials (aliens) in the remote past. Can you think of any tests that could support or refute that theory? Is it falsifiable? Would you regard this proposal as science or pseudoscience?
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