1 / 16

The Scientific Method

The Scientific Method. Lecture 2 8-13-14. I CAN explain the steps of the scientific method and identify variables involved in experimental study. Introduction to the Scientific Process . The Scientific Method is a logical, systematic approach to solving a scientific problem.

juneflippo
Download Presentation

The Scientific Method

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Scientific Method Lecture 2 8-13-14

  2. I CAN explain the steps of the scientific method and identify variables involved in experimental study.

  3. Introduction to the Scientific Process • The Scientific Method is a logical, systematic approach to solving a scientific problem.

  4. Overview of the Scientific Process Conclusions can lead to revising the existing hypothesis or developing a new hypothesis.

  5. Step 1: Identify a Problem • Observe the world around you. • Using observations, identify a problem you would like to solve. • This is a question you DO NOT know the answer to and can’t look up and must be testable. • “Why” and “What would happen if…” are good beginnings of scientific questions.

  6. Step 2: Gather Information • Use references to do background research. • (Do not need to reinvent the wheel!) • Books • Journals • Magazines • Internet • TV • Videos • Interview Experts

  7. Step 3A: Formulate a Hypothesis • Possible answer to a question that can be tested. • Based on observations and knowledge. • “If”“Then”or“Because”statement.

  8. Step 3B: Formulate a Null Hypothesis • It’s very possible that a hypothesis will NOT be supported by the research. • An experiment also has a NULL HYPOSTHESIS – this is a statement that says there is NO RELATIONSHIP BETWEEN THE VARIABLES being studied in the experiment.

  9. Step 4: Develop an Experiment • An EXPERIMENT is a procedure designed to TEST A HYPOTHESIS. • Organized, well thought out, step by step process. • Can take place in a LABORATORY or in the FIELD. • Involves a number of VARIABLES – factors that can change the outcome of the experiment.

  10. Variables: Manipulated Variable • The MANIPULATED VARIABLE is the factor that the experimenter CHANGES to observe its effect(s). • Sometimes called the Independent Variable.

  11. Variables: Responding Variable • Changes in response to the manipulated variable. • Is measured in the experiment. • Sometime called the Dependent Variable.

  12. Variables: Constant • All the factors in the experiments that are kept the same are known as CONSTANTS. • Everything except the manipulated and responding variables. • Keeps the experiment “fair”.

  13. Variable: Control Group The normal condition that you compare the responding variable to. Allows the experimenter to decide the effects of the manipulated variable.

  14. Step 5: Record and Organize Data • Write down all observations and measurements. • NEVERdestroy data! • Use tables/graphs/chartsto organizeyour data. • Label Everything including manipulated and responding variables.

  15. Step 6: Analyze Data EXAMINE the data collected. Does it SUPPORT the hypothesis? • YES • Repeat experiment. • Have others conduct same experiment. • NO • Repeat experiment. • Review/discard hypothesis.

  16. Exit Slip A student in Mrs. Wright’s agriculture class wants to know if Miracle Grow fertilizer will help tomato plants grow larger than a generic brand from Wal-Mart. The student plants three plots of 20 plants each. One receives Miracle Grow, one the generic brand and the third no fertilizer. The height of the plants is measured and recorded every three days for 6 weeks. 1. What would be a valid hypothesis for this experiment? 2. What would be a null hypothesis for this experiment? 3. Why did the third group of plants get no fertilizer at all? 4. What are some controls in this experiment?

More Related