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Scientific Method

Scientific Method. Karen J. Dalton Community College of Baltimore County Catonsville Campus. Observations What you know before you begin an experiment Accepted scientific knowledge Journals, textbooks What you see in the world around you What did Semmelweis observe?

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Scientific Method

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  1. Scientific Method Karen J. Dalton Community College of Baltimore County Catonsville Campus

  2. Observations • What you know before you begin an experiment • Accepted scientific knowledge • Journals, textbooks • What you see in the world around you • What did Semmelweis observe? • What is the problem? Ask a question? • What did he ask? • Hypothesis: Educated answer to your question • Must be based on accepted science • What is your answer to Semmelweis’ problem?

  3. Test you hypothesis • Experimental design • Control groups vs. experimental groups • Large numbers in the groups • Repeatable experiments • How did Semmelweis test his hypothesis? • Results • Data collected as a result of the experiment • Conclusions • What do your results mean? • Results are new observations • Should you now alter your hypothesis?

  4. Theory • Well substantiated explanation of something in the natural world • Explanation uses many different pieces of evidence • Examples: cell, atomic, evolution, chromosomal inheritance • In science this is “as good as it gets” • Lay people use the word theory when they should be using the word hypothesis

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