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Notes scientific investigation


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  • 1. Scientific Investigations
  • 2. Scientists conduct investigations for different reasons. All investigations require a 1. question, careful 2.observations and collection.
  • 3. There are two major types of data: QuaLitative and QuaNtitative
  • 4. QuaLitative Data: Data which uses descriptive words (notice the L for letters!)
  • 5. Describing data is gathered with the appropriate five senses: • 1. Sight • 2. Hear • 3. Smell • 4. Taste • 5. Touch
  • 6. QuaNtitative Data: Data which uses numbers from measurements (notice the N for numbers!)
  • 7. Once data is gathered, scientists thoroughly study the data to identify patterns which may lead to answering the original question.
  • 8. There are different types of investigations that scientists may perform.
  • 9. Descriptive Investigations… *Gathers data which measures or *describes objects or events
  • 10. Descriptive Investigations… Collect: quaLitative and/or quaNtitative data
  • 11. Descriptive Investigations… Includes: 1. question or 2.problem, but…..
  • 12. Descriptive Investigations… DO Does NOT have 1. hypothesis. 2.independent variables or 3.dependent variables.
  • 13. Comparative Investigations… Collect data on different organisms, orbects or events or under different conditions Comparative Investigations… *Gathers data on different organisms, objects or events or under different conditions.
  • 14. Comparative Investigations… Can *compares two or more objects or events.
  • 15. Comparative Investigations… Can *describe quantitatively and qualitatively by finding the similarities and differences between organisms, objects or events
  • 16. Comparative Investigations… Collects: 1.quaLitative observations by getting measurements 2.quaNtitative observations by measuring the temperature, time , location, etc.
  • 17. Comparative Investigations… Includes: 1.question and 2.hypothesis.
  • 18. Comparative Investigations… Have a 1.hypothesis , 2.dependent variable and 3.independent variable
  • 19. Experimental Investigations… *Gathers data to test a single manipulated variable *Describes quantitatively and qualitatively
  • 20. Experimental Investigations… *Compares any changes in the dependent variable to a control.
  • 21. Experimental Investigations… Collects: 1. quaLitative and 2.quaNtitative data to test the manipulating Variable.
  • 22. Experimental Investigations… Iincludes: a 1.question and a 2.hypothesis
  • 23. As well as includes a 3.control and a 4.constant. These are two different things.
  • 24. Experimental Investigations… Have a 1.hypothesis and both an 2.independent variables and 3.dependent variables and a 4.control. Control Miracle Grow Scotts
  • 25. Control: A control is an exact setup of the experiment you are performing. Everything is identical except for the variable that you are testing. Water + NaCl Water + KCl Water + PCl₅Water
  • 26. Constant: Factor(s) that is(are) kept the same in all trials of an investigation. For Example: * The height a paper helicopter is dropped. * The size of what is considered to be a “drop” of liquid. * How hard you throw the ball.
  • 27. The Independent (manipulated) Variable: Something you may change during an experiment to determine its affect. I decide what I will test. Notice the I in Independent!
  • 28. The Dependent (responding) Variable: This is the variable you want to study to see if it is affected by the independent variable. The affects (results) depend on the independent variable. Notice the D in Dependent!
  • 29. Let’s pull it all together… Using your notes, Fill in the data table.
  • 30. RStatement Descriptive Comparative Experimental Has independent variables x x Has dependent variables x x Has a control x Uses quaNtitative data x x x Uses quaLitative data x x x Compares changes x x Describes objects or events x x x