CUnit_1Measurement20102011L

CUnit_1Measurement20102011L - Chemistry 1L Chemistry...

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Chemistry 1L Chemistry 1L Cypress Creek High School Cypress Creek High School Chapters: 1 & 2
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Scientific Method / Process Scientific Method / Process The Scientific Method is a systematic approach to problem solving. It is generally composed of the following parts: Question Hypothesis Experiment Data Analysis Conclusion
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Question: How can I maximize the diameter of the tomatoes in my garden? Hypothesis: Adding fertilizer to the soil will increase the tomato diameter.
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Experiment Experiment Experiment: Use a variety of fertilizers and measure the resulting tomato diameters A well designed experiment includes: Independent variable Dependent variable Controlled variables Control group
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Experiment - Independent Variable Experiment - Independent Variable Independent Variable The independent variable is the one that is changed (type of fertilizer) It is also called the manipulated variable or the X variable; ( remember MIX ) You can only have one independent variable in an experiment - otherwise, results cannot definitively be attributed to a single factor
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Experiment - Dependent Variable Experiment - Dependent Variable Dependent Variable The dependent variable is the one that is effected by the change (diameter of tomato) It is also called the response variable or the Y variable; ( remember DRY ) Larger sample size means more reliable results
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Experiment - Controlled Variables Experiment - Controlled Variables Controlled Variables The controlled variables are those that remain constant (species of tomato plant, exposure to sunlight, type of potting, amount of water, etc.) More controlled variables means more reliable results
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Experiment - Control Group Experiment - Control Group Control Group The control group is unexposed to the independent variable (group of tomato plants with no fertilizer added) It is used as a benchmark to compare results and minimize bias
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Data Analysis Data Analysis Data Analysis organizes the results by using charts and graphs. Fertilizer Effects on Tomato Diameter 0 5 10 15 20 25 30 Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Week 8 Week 9 Week 10 Time (Weeks) Miracle Gro Perfectly Natural Jobe's No Fertilizer Miracle Gro Perfectly Natural Jobe’s No fertilizer Week 1 0 cm 0 cm 0 cm 0 cm Week 2 2 cm 2 cm 1 cm 1 cm Week 3 6 cm 2 cm 3 cm 2 cm Week 4 9 cm 5 cm 4 cm 4 cm Week 5 12 cm 7 cm 5 cm 4 cm Week 6 13 cm 11 cm 9 cm 7 cm Week 7 13 cm 16 cm 14 cm 8 cm Week 8 15 cm 20 cm 17 cm 8 cm Week 9 18 cm 24 cm 18 cm 10 cm Week 10 20 cm 28 cm 21 cm 11 cm
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Conclusion Interpret Results: Fertilizer increased the tomato diameter compared to the control group. Groups with fertilizer (at least) doubled the diameter.
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This note was uploaded on 09/22/2011 for the course SCIENCE idk taught by Professor All during the Fall '11 term at University of Houston.

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CUnit_1Measurement20102011L - Chemistry 1L Chemistry...

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