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Page 1© Amy Brown – Science Stuff
Page 2
What is Science?
The goal of science is to investigate
and understand the natural world, to
explain events in the natural world, and
to use those explanations to make
useful predictions.
1. Science deals only
with the natural world.
2. Scientists:
collect and organize
information in a careful,
orderly way, looking for
patterns and connections
between events.
3. Scientists propose
___________ that can
be ______ by
examining evidence.
explanations
tested
4. Science is an organized way
of using evidence to learn about
the natural world.
4. Science is an organized way
of using evidence to learn about
the natural world.
Page 3
How is Science Done?How is Science Done?
Science begins with
an _____________.
This is the process of
gathering information
about events or
processes in a careful,
orderly way.
observation
Data is the information gathered from making
observations.
Page 4
There are two types of data:
Quantitative data are: numbers and are
obtained by counting
or measuring.
Qualitative data are:
descriptions
and involve
characteristics
that cannot be
counted.
Page 5
Hypothesis
Page 6
Scientific Methods
The scientific method is:
A series of steps used by scientists to
solve a problem or answer a question.
The Steps to the Scientific Method
1.Observation / Asking a Question
2.Form a Hypothesis
3.Design a Controlled Experiment
4.Record and Analyze Results
5.Draw Conclusions

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Scientific method power point

  • 1. Page 1© Amy Brown – Science Stuff
  • 2. Page 2 What is Science? The goal of science is to investigate and understand the natural world, to explain events in the natural world, and to use those explanations to make useful predictions. 1. Science deals only with the natural world. 2. Scientists: collect and organize information in a careful, orderly way, looking for patterns and connections between events. 3. Scientists propose ___________ that can be ______ by examining evidence. explanations tested 4. Science is an organized way of using evidence to learn about the natural world. 4. Science is an organized way of using evidence to learn about the natural world.
  • 3. Page 3 How is Science Done?How is Science Done? Science begins with an _____________. This is the process of gathering information about events or processes in a careful, orderly way. observation Data is the information gathered from making observations.
  • 4. Page 4 There are two types of data: Quantitative data are: numbers and are obtained by counting or measuring. Qualitative data are: descriptions and involve characteristics that cannot be counted.
  • 6. Page 6 Scientific Methods The scientific method is: A series of steps used by scientists to solve a problem or answer a question. The Steps to the Scientific Method 1.Observation / Asking a Question 2.Form a Hypothesis 3.Design a Controlled Experiment 4.Record and Analyze Results 5.Draw Conclusions
  • 7. Page 7 Step 1: Observation / Asking a Question Step 2: Form a Hypothesis A problem or a question must first be identified. How much water can a root hair absorb? Why does a plant stem bend toward the light? What effect does temperature have on heart rate? Hypothesis A possible explanation to the question or problem. It is simply a prediction and has not yet been proven or disproven. It must be stated in a way that is testable. A statement is considered “testable” if evidence can be collected that either does or does not support it.
  • 8. Page 8 Step 3: Designing a Controlled Experiment 1. The factors in an experiment that can be changed are called variables. Some example of variables would be: changing the temperature, the amount of light present, time, concentration of solutions used. 2. A controlled experiment works with one variable at a time. If several variables were changed at the same time, the scientist would not know which variable was responsible for the observed results. 3. In a “controlled experiment” only one variable is changed at a time. All other variables should be unchanged or “controlled”. 4. An experiment is based on the comparison between a ____________ with an ________________. control group experimental group a) These two groups are identical except for one factor. b) The control group serves as the comparison. It is the same as the experiment group, except that the one variable that is being tested is removed. c) The experimental group shows the effect of the variable that is being tested.
  • 9. Page 9 Example: In order to test the effectiveness of a new vaccine, 50 volunteers are selected and divided into two groups. One group will be the control group and the other will be the experimental group. Both groups are given a pill to take that is identical in size, shape, color and texture. Describe the control group. Describe the experimental group. What variables are kept constant? What variable is being changed? Even though the volunteers are given identical looking pills, the control group will not actually receive the vaccine. This group will receive the vaccine. The size, shape, color, and texture of the pill. Whether or not the pill contains the vaccine.
  • 10. Page 10 There are two variables in an experiment: a) The independent variable is the variable that is deliberately changed by the scientist. a) The independent variable is the variable that is deliberately changed by the scientist. b) The dependent variable is the one observed during the experiment. The dependent variable is the data we collect during the experiment. This data is collected as a result of changing the independent variable. c) In the above example, what is the independent variable? It is the addition of the vaccine to the pills that were given to the volunteers. d) In the above example, what is the dependent variable? The observed health of the people receiving the pills.
  • 11. Page 11 Step 4: Recording and Analyzing Results 1. The data that has been collected must be organized and analyzed to determine whether the data are reliable. 2. Does the data support or not support the hypothesis?
  • 12. Page 12 Step 5: Drawing Conclusions The evidence from the experiment is used to determine if the hypothesis is proven or disproven. Experiments must be repeated over and over. When repeated, the results should always be the same before a valid conclusion can be reached.
  • 13. Page 13 Forming a Theory A theory may be formed after the hypothesis has been tested many times and is supported by much evidence. Theory: A broad and comprehensive statement of what is thought to be true. A theory is supported by considerable evidence.
  • 14. Page 14 You want to determine the effects of a certain fertilizer on the growth of orchids grown in a greenhouse. Materials that are available to you include: greenhouse, 100 orchid plants, water, fertilizer, and soil. You want to know if the orchids will grow best with a weak concentration of fertilizer, a medium concentration of fertilizer, or a high concentration of fertilizer. How will you design an experiment to test different concentrations of this fertilizer? State your hypothesis: Possible answer: I predict that the orchids will grow best with a medium concentration of fertilizer.
  • 15. Page 15 Here is one possibility: The 100 plants will be divided into 4 groups as follows: The plants will be watered daily. Over a period of a month, the plants will be measured to see which ones grew the tallest. Group 1: 25 plants will receive plain water. Group 2: 25 plants will receive a weak concentration of fertilizer. Group 3: 25 plants will receive a medium concentration of fertilizer. Group 4: 25 plants will receive a high concentration of fertilizer.
  • 16. Page 16 Control Group Experimental Group What is the control group in this experiment? The control group consists of the 25 plants that are receiving plain water. What is the experimental group in this experiment? The experimental group consists of the 75 plants that are receiving various concentrations of fertilizer.
  • 17. Page 17 In a “controlled experiment”, all variables must be kept constant except the one variable that is being changed. In a “controlled experiment”, all variables must be kept constant except the one variable that is being changed. What variables must be kept constant in this experiment? All plants must receive the same amount of fluid each day. All plants are grown in pots of equal size. All plants are grown at the same temperature. All plants receive the same amount of sunlight. What variable is being changed in this experiment? The variable being changed is the amount of fertilizer received by each group of plants. What variable is being changed in this experiment? The variable being changed is the amount of fertilizer received by each group of plants.
  • 18. Page 18 Group 1 (Control Group): Grew to an average height of 15 cm. Group 2 (Weak conc.): Grew to an average height of 35 cm. Group 3 (Medium conc.): Grew to an average height of 28 cm. Group 4 (High conc.): Grew to an average height of 10 cm. Is your hypothesis supported or disproved by these results? We hypothesized that the orchids would grow best with a medium concentration of fertilizer. The results do not support this. The results disprove our hypothesis. Is your hypothesis supported or disproved by these results? We hypothesized that the orchids would grow best with a medium concentration of fertilizer. The results do not support this. The results disprove our hypothesis.
  • 19. Page 19 Group 1 (Control Group): Grew to an average height of 15 cm. Group 2 (Weak conc.): Grew to an average height of 35 cm. Group 3 (Medium conc.): Grew to an average height of 28 cm. Group 4 (High conc.): Grew to an average height of 10 cm. What is your conclusion based on these results? Orchids grow best with a weak concentration of fertilizer. At medium to high concentrations, plant growth is inhibited. What is your conclusion based on these results? Orchids grow best with a weak concentration of fertilizer. At medium to high concentrations, plant growth is inhibited.
  • 20. Page 20 Analysis Questions Why is it important to have a large sample size in any experiment? It is important to test a large sample in order to get a true picture of the results of the experiment. If the sample size is too small, an inaccurate conclusion may be reached. Results obtained by testing a large number of individuals would be much more accurate than if only a few individuals had been tested.
  • 21. Page 21 Analysis Questions Why is it important to repeat the experiment many times? Experiments should be repeated to see if the same results are obtained each time. This gives validity to the test results.
  • 22. Page 22 Analysis Questions What is the importance of the control? The control shows what will happen when the experimental factor is omitted. Without the control, there would be no basis for comparison and you would not know how the experimental factor affected the results.
  • 23. Page 23 Analysis Questions How is a theory different than a hypothesis? A hypothesis is an “educated guess” that is testable through observations and experimentation. A theory is a broad statement of what is believed to be true based on many experiments and considerable amounts of data.
  • 24. Page 24 Analysis Questions Why is it so important that a scientist accurately describes the procedure used in the experiment? It allows other scientists to repeat the experiment and verify the results.
  • 25. Page 25 Analysis Questions What is the difference between the independent and the dependent variables in an experiment? The independent variable is the variable that is deliberately changed by the scientist. The dependent variable is the one observed during the experiment. The dependent variable is the data we collect during the experiment.
  • 26. Page 26 Analysis Questions In a “controlled experiment”, why must all of the variables, except one, be kept constant throughout the experiment? If several variables were changed at the same time, the scientist would not know which variable was responsible for the observed results.
  • 27. Page 27 Created by Amy Brown – Science Stuff Copyright © January 2012 Amy Brown (aka Science Stuff) All rights reserved by author. This document is for your classroom use only. This document may not be electronically distributed or posted to a web site.