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Scientific Inquiry

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					Scientific Inquiry
  What is Science?
What is Science?

 A body of knowledge
 A set of theories that
  describes the world
 A way of learning about the
  world
 A method to answer
  questions about the natural
  world
How do Scientists Learn
About the World?
1. Ask a question
2. Make a prediction
3. Test the prediction
4. Compare results to the
   prediction
5. Make a conclusion
6. Hypothesis is either rejected, or
   supported
The Scientific Method-ask a question

 Only questions which can be
  answered through experiments.
   Examples of good scientific
    questions:
     How does the amount of nitrogen
      fertilizer affect the height of pea
      plants?
     Does increasing the temperature of
      an enzyme increase its rate of
      reaction?
Write a Good
Scientific Question.




Scientific Method-make
a prediction
 Make a prediction
  A scientists prediction about the results of
   an experiment is called the hypothesis
  The hypothesis must be testable and
   specific and always written as a
   statement
  Hypotheses usually begin with “I think
   that……” or “If…………then…………”
  Example: I think that the more fertilizer
   that a pea plant gets, the taller it will
   grow
Scientific Method-test
the prediction
 Controlled Experiments
   Used by Scientists to test their
    hypothesis
   Always have at least two groups:
      Control Group- stays the same
      Experimental Group- changes,
       receives some sort of
       treatment
How are the control group and the
experimental group different?



1.

2.
Scientific Method-
compare results
 Scientists analyze the data collected
 Data is information
 Compare the data from the control
  group with the experimental group
 Use statistics to see if there is
  significant difference
 Example- the pea plants in the
  experimental group grew an average
  of 18.3cm, while the control group
  grew an average of 12.6cm
Scientific Method- make
a conclusion
 Examine data, charts,
  graphs, to determine if the
  hypothesis is supported or
  rejected
 Could the differences be
  due to chance?
   Use statistics to tell
Scientific Method-
hypothesis rejected or
supported?
 If supported, repeat experiment
  to see if it is valid ( able to be
  repeated with the same results)
 If rejected, then come up with a
  new hypothesis and experiment,
  repeat the process
Controlled Experiments-
variables
 Three types of variables:
    Independent- the thing that is
     different between the experimental
     and control group
    Dependent- the data you collect
     as your experiment progresses,
     depends on the independent
     variable
    Controlled- remains the same
I set up an experiment with 30 pea
plants. I give 10 plants no fertilizer, 10
plants 5g. of fertilizer, and 10 plants
15g. of fertilizer. After 14 days I
measure the height of the plants.

 What is the independent variable?
    The amount of fertilizer
 What is the dependent variable?
    The height of the pea plants
 What are the 2 controlled variables?
    The amount of soil and water
 What is the control group?
    Plants with no fertilizer
 What is the experimental group?
    The two groups of plants getting fertilizer
What makes a good
experiment?
 Large number of samples
 Only one independent
  variable
 Validity
 Conclusions based on
  evidence
 Is based on fact, not opinion
Design an Experiment !
 Think of an experiment to test the
  hypothesis that sleeping more
  than 8 hours a night improves a
  students grades on Science
  quizzes!
     Control group:
     Experimental Group:
     Independent Variable:
     Dependent Variable:
     Controlled Variables:

				
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posted:5/14/2013
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