Experimental Design Scientific Method Intro Chapter P 6-7 Scientific Method Intro Chapter P 6-7.

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Presentation transcript:

Experimental Design Scientific Method Intro Chapter P 6-7 Scientific Method Intro Chapter P 6-7

Diverse way in which scientists explore or investigate problems and seek to answer and explore these problems through the scientific method. What is Scientific Inquiry?

What is the very first thing one must do in order to learn anything? –1. State the problem. ___________ a question. Scientific Method

1 Materials- Using the materials on your desk, write a problem. Scientific Method

Step 2. Hypothesis- a _____________ statement in the form of an if then statement. Create a hypothesis for your problem. Scientific Method

Step 3 Design Experiment Brainstorming Worksheet (Orange) create a list of things that you can change or vary using the materials and write each on it’s own post-it note. create a list of things that you can measure or observe. Scientific Method

Step 3 Design Experiment –Variable Worksheet (Green) –Independent Variable is the variable that is __________________. ________________ it. Select one variable from the things you could change or vary and place it in the I will measure box. Scientific Method

Step 3 Design Experiment –Dependent Variable is the variable that is __________________. Select one variable item from the things you could measure and observe and place it in the I will measure box. Scientific Method

Step 3 Design Experiment –Using the remainder of the post-it notes from the list of things you could change or vary, place those with the things you will keep the same for the experiment. These will become the constants for your experiment. –Constants- are factors we want to keep the same. Helps scientists know that the independent variable is causing the change. Scientific Method

Step 3 Design Experiment –Control- serves as a ______________ for the scientists. Example: –Placebo- when testing medicine. »One group gets the meds. »One group gets the placebo. »Was there any change due to the drug? Control for the Ice Experiment? Scientific Method

What does it mean to make observations? What might you be looking for in this experiment? Observations

What do you know based on previous knowledge? Inferences

Distance between two points. Tool used: Meter Stick or Metric Ruler Unit = cm- centimeters Length

The amount of space an object occupies or the amount of space something contains. Solid- Liquid Volume –Tool Used- Graduated Cylinder Meniscus Line- The curved line Units = mL Irregular Solid- Volume

Mass The Amount of matter that makes up an object. Mass is constant, –which means it is always the same. Tool used- Balance –Measured in grams (g)

Mass Practice reading the balance below:

Control Independent Variable Dependent Variable Group A Group B Group C Group DGroup EGroup F Data Table

A useful way to summarize your data. –Elements of a good graph Neatly constructed (use a straight edge) Use the entire sheet of graph paper. Create a scale for the x and y axis. Label the axis Title your graph. Provide a key if needed. Graphing Data

Conclusion- Explain what happened? (Do not use first or third person in your written conclusion- personal pronouns, no I or we in the conclusion) –Restate the problem that was investigated. (circle in the example) –State what the hypothesis was. (underline) –Explain what the results showed. (Box in) –Did the results support of disprove the hypothesis? (draw a star) –List any questions this data now leads you to? (Explain find out the answer to your question.) (lightly shade) Conclusion

The problem investigated was to see how aspirin affected the growth of a cut flower. The hypothesis that aspirin in the water of cut carnations would help the flowers last longer was not supported by the data. As the amount of aspirin was increased in the water, the flowers died faster. The control of the flower that did not have any aspirin in the water lasted the longest. From this data the conclusion would have to be that aspirin does not help the carnation last longer. However, this does bring up the question, what is it in aspirin that kills the flowers so fast? Example Conclusion

Water / Salt Water Results

A well tested scientific concept that explains a wide range of observations. It is an explanation for observable events or facts for which no exception has been found. –Big Bang Theory Enough evidence supports this theory. What is Scientific Theory?

They are generalizations about how the natural world behaves under certain conditions. Example: –Has an object ever fallen up? The law of gravitation. What is Scientific Law?