15: Scientific Reasoning
- Page ID
- 22054
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)Because the contributions of modern science are our culture's best examples of advances in knowledge, it is important for everyone to have some appreciation of how scientists reason. Previous chapters in this book discussed three main aspects of scientific reasoning: justifying a scientific claim, explaining phenomena, and making new discoveries. This chapter more deeply examines the nature of scientific reasoning, showing how to assess the scientific claims we encounter in our daily lives, how to do good scientific reasoning, and how to distinguish science from mere pseudoscience. We begin with a description of science and a review of some of the method s of doing science that were introduced in previous chapters.
- 15.1: What is Science?
- This page defines science as a method for acquiring knowledge through observation and experimentation, emphasizing its empirical nature and the scientific method's role in ensuring reliability and tentativeness. It distinguishes science from pseudoscience and engineering applications, warning against conflating meticulous hobbies with scientific inquiry. The page underscores the importance of rigorous methods in achieving scientific understanding and the rejection of supernatural explanations.
- 15.2: Reviewing the Principles of Scientific Reasoning
- This page outlines the distinctions between scientific and everyday reasoning, emphasizing the need for rigorous proof in scientific methods. It highlights that scientists base conclusions on expert insights and comprehensive data rather than personal observations. Establishing broad laws from specific facts enables predictions and explanations while allowing the application of knowledge to new situations.
- 15.2.1: Testability, Accuracy, and Precision
- 15.2.2: Reliability of Scientific Reporting
- 15.2.3: Causal Explanations vs. Causal Arguments
- 15.2.4: Good Evidence
- 15.2.5: A Cautious Approach with an Open Mind
- 15.2.6: Discovering Causes, Creating Explanations, and Solving Problems
- 15.2.7: Confirming by Testing
- 15.2.8: Aiming to Disconfirm
- 15.3: Superstition
- This page explores cultural beliefs and superstition, highlighting the clash between Western science and tribal practices, such as a leader's virgin sacrifices to appease a sun god. It argues for the objectivity of truth over cultural relativism, defining superstition as adherence to beliefs against evidence. The text emphasizes the value of evidence, introduces Occam's Razor for belief evaluation, and notes that superstition does not diminish rationality in other areas.
- 15.4: Looking for Alternative Explanations
- This page explores mass hallucination and its questionable link to mass hypnotism through the Indian rope trick, proposing a hidden wire as an alternative explanation. It then examines a hypothetical investment scheme by GHA, highlighting the need to consider all possibilities when assessing claims. The page underscores the importance of logical reasoning and skepticism to prevent deceit, illustrated by a fictional prophecy manuscript as a case study.
- 15.5: Creating Scientific Explanations
- This page emphasizes that understanding truth is demonstrated through the ability to explain phenomena, specifically supporting the Earth's roundness with historical evidence. It uses examples like Magellan's navigation, lunar eclipses, and the sighting of ships at sea to illustrate how the round-Earth hypothesis coherently accounts for these observations. The text underlines the importance of scientific advancement through explanatory power, linking hypotheses to observable evidence.
- 15.6: Testing Scientific Explanations
- This page highlights the critical importance of testing claims to verify their validity. It stresses that without proper evidence, one cannot confidently determine the truth of a statement or belief. The text emphasizes the need for empirical investigation and critical analysis to avoid misinformation, ultimately asserting that testing is essential for understanding and establishing truth.
- 15.7: Detecting Pseudoscience
- This page distinguishes between science and pseudoscience, emphasizing the lack of credibility in pseudoscience, with examples like astrology and spiritualism. It notes the challenges in defining pseudoscience but offers key identifying features. The discussion includes parapsychology, a field studying paranormal phenomena, which has failed to yield reproducible results. The page concludes that without a solid, testable theory, parapsychology cannot be classified as a science.
- 15.8: Paradigms and Possible Causes
- This page explores the significance of paradigms in science, detailing how each discipline establishes its own methods and standards for what constitutes a legitimate cause. It argues that non-scientific explanations, such as those involving irrelevant or supernatural factors, are excluded from these paradigms. Through examples in medical and biological sciences, it underscores the necessity of controlling experiments to prevent contamination and validate conclusions.
- 15.9: Review of Major Points
- This page discusses the scientific method, highlighting the importance of hypothesizing and testing to uncover general principles about nature. It defines a hypothesis as a testable guess, which may evolve into a law through rigorous testing. The page emphasizes that scientific reasoning demands higher standards than everyday reasoning, focusing on accuracy, reproducibility, and coherence with existing knowledge.
- 15.10: Glossary
- This page explores essential elements of scientific experimentation and paranormal studies, defining terms like hypotheses and theories. It addresses issues like ad hoc rescue (defending claims despite evidence), experimenter effects (bias), and the importance of control groups and decisive tests. It emphasizes the value of effective theories in research, while also discussing parapsychology, types of ESP, and the difference between genuine effects and placebo influences.
- 15.11: Exercises
- This page emphasizes the importance of scientific reasoning, critical thinking, and methodology in evaluating health claims and various phenomena. It covers key concepts including hypothesis testing, distinguishing correlation from causation, and identifying logical fallacies. The content encourages rigorous validation of claims across diverse fields while promoting critical assessment of theories and arguments.