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Experimental Design Some Terms. Elements to a good experiment Question Question Hypothesis Hypothesis Reasonable and testable explanation for observations.

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Presentation on theme: "Experimental Design Some Terms. Elements to a good experiment Question Question Hypothesis Hypothesis Reasonable and testable explanation for observations."— Presentation transcript:

1 Experimental Design Some Terms

2 Elements to a good experiment Question Question Hypothesis Hypothesis Reasonable and testable explanation for observations (if... Then statement) Reasonable and testable explanation for observations (if... Then statement) Independent Variable Independent Variable What is purposefully changed in the experiment What is purposefully changed in the experiment Dependent Variable Dependent Variable What changes as a result of the independent variable What changes as a result of the independent variable

3 Experiments continued Constants Constants What must be kept the same in an experiment What must be kept the same in an experiment Control Control Trial excluding independent variable- acts as a standard for comparison Trial excluding independent variable- acts as a standard for comparison Trials- the number of times experiment is conducted- should be multiple times Trials- the number of times experiment is conducted- should be multiple times

4 Continued... Procedure: Step by step explanation of how you are conducting your experiment Procedure: Step by step explanation of how you are conducting your experiment If well-written, then anyone should be able to do your experiment If well-written, then anyone should be able to do your experiment Observations/data collection Observations/data collection Recording of observations or data Recording of observations or data Usually in the form of a data table Usually in the form of a data table

5 Continued: Results: Formal recording of the results- usually in the form of a graph Results: Formal recording of the results- usually in the form of a graph Conclusions- must contain 3 items Conclusions- must contain 3 items Was your hypothesis correct? Was your hypothesis correct? How do you know? (prove it from the data) How do you know? (prove it from the data) Error in your experiment? Error in your experiment?

6 Example from homework: Question: Question: Hypothesis Hypothesis IV IV DV DV Constants Constants Control Control Trials Trials

7 Procedure Procedure Ob/data collection Ob/data collection Results Results conclusion conclusion


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