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Evaluating Scientific Explanation

Evaluating Scientific Explanation

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Chapter 1 S4 Chapter 1 S4 Presentation Transcript

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  • Chapter: The Nature of Science Table of Contents Section 3: Models in Science Section 1: What is science? Section 2: Science in Action Section 4: Evaluating Scientific Explanation
    • Do you believe everything you read or hear?
    4 Evaluating Scientific Explanation Believe it or not?
    • Think of something that someone told you that you didn’t believe.
    • Chances are you looked at the facts you were given and decided that there wasn’t enough proof to make you believe it.
    • “ Believe none of what you hear, only some of what you read, and half of what you see.”
    • What you did was evaluate, or judge the reliability of what you heard.
    4 Evaluating Scientific Explanation Believe it or not?
    • When you hear a statement, you ask the question “How do you know?”
    • When you evaluate something, you use critical thinking - judging the reliability of what you heard, read, or seen.
    4 Evaluating Scientific Explanation Critical Thinking
    • Critical thinking means combining what you already know with the new facts that you are given to decide if you should agree with something.
    • You can evaluate an explanation by breaking it down into two parts.
    4 Evaluating Scientific Explanation Critical Thinking
    • First you can look at and evaluate the observations.
    • Then you can evaluate the inferences—or conclusions made about the observations.
    • A scientific investigation always contains observations—often called data .
    4 Evaluating Scientific Explanation Evaluating the Data
    • Data are gathered during a scientific
    investigation and can be recorded in the form of descriptions, tables, graphs, or drawings.
  • 4 Evaluating Scientific Explanation Evaluating the Data
    • You should be cautious about believing any claim that is not supported by data.
    • The data given to back up a claim should be specific.
    4 Evaluating Scientific Explanation Are the data specific?
    • That means they need to be exact.
    • When you are given specific data, a statement is more reliable and you are more likely to believe it.
    • An example of data in the form of a frequency table is shown.
    4 Evaluating Scientific Explanation Are the data specific?
    • A frequency table shows how many times types of data occur.
    • Scientists must take thorough notes at the time of an investigation.
    4 Evaluating Scientific Explanation Take Good Notes
    • Important details can be forgotten if you wait several hours or days before you write down your observations.
    • It is also important for you to write down every observation, including ones that you don’t expect.
    4 Evaluating Scientific Explanation Take Good Notes
    • Often, great discoveries are made when something unexpected happens in an investigation.
    • In science class, you will be keeping a science journal.
    4 Evaluating Scientific Explanation Your Science Journal
    • You will write down what you do and see during your investigations.
    • Your observations should be detailed enough that another person could read what you wrote and repeat the investigation exactly as you performed it.
    4 Evaluating Scientific Explanation Your Science Journal
    • Scientists require repeatable evidence.
    4 Evaluating Scientific Explanation Can the data be repeated?
    • When a scientist describes an investigation, other scientists should be able to do the investigation and get the same results.
    • The results must be repeatable.
    • When you think about a conclusion that someone has made, you can ask yourself two questions.
    4 Evaluating Scientific Explanation Evaluating the Conclusions
    • First, does the conclusion make sense?
    • Second, are there any other possible explanations?
    • Suppose you saw an advertisement in the newspaper like the one shown.
    4 Evaluating Scientific Explanation Evaluating Promotional Materials
    • What would you think? First, you might ask, “Does this make sense?” It seems unbelievable.
    • How was this claim tested?
    4 Evaluating Scientific Explanation Evaluating Promotional Materials
    • How is the amount of wrinkling in skin measured?
    • You might also want to know if an independent laboratory repeated the results.
    • An independent laboratory is one that is not related in any way to the company that is selling the product or service.
    • Results from an independent laboratory usually are more reliable than results from a laboratory paid by the selling company.
    4 Evaluating Scientific Explanation Evaluating Promotional Materials
    • It is important that you carefully evaluate advertising claims and the data that support them before making a quick decision to spend your money.
  • 4 Section Check Question 1 The formal term for observations made during a scientific experiment is_______. A. conclusion B. data C. hypothesis D. theories NC: 1.09
  • 4 Section Check Question 2 When supporting a claim, you’ll want to have data that is _______. A. impressive B. new C. made up D. specific NC: 1.05
  • 4 Section Check Question 3 Suppose a person claims to have done an experiment that made him briefly invisible but says that it cannot be done again. You would not believe this person, because _______. NC: 1.09
  • 4 Section Check
    • Credible scientific experiments must be
    • repeatable.
    • B. It isn’t possible to become invisible.
    • C. No one has ever turned invisible before.
    • D. You were not there to see the experiment
    • performed.
    NC: 1.09
  • 4 Section Check Answer The answer is B. When you evaluate a scientific claim you should examine the data. Is it given? Does it support the claim? NC: 1.09
  • 4 Section Check Answer The answer is D. The data should be as specific as possible, weeding out generalizations that don’t really help explain the world. NC: 1.05
  • 4 Section Check Answer The correct answer is A. All scientific experiments must be repeatable before the results can be believed. NC: 1.09
  • End of Chapter Summary File