I. Building an Experiment

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Terms in this set (...)

Objective Observation
Factual, uses five senses, describes qualities, describes quantities.
Inference
Statements that explain or interpret observations, usually based on what you already know.
Subjective Observation
Personal opinions, tainted by observers.
Pose Questions
Brainstorm questions that are interesting to you, avoid questions that are easily answered, think about the logistics of your question.
Hypothesis
A statement that proposes a possible explanation to some phenomenon, event or scientific problem that can be tested by further investigation.
Controlled experiment
An experiment in which one variable is tested and all other conditions are kept exactly the same.
Independent Variable
The variable that a scientist makes changes to; affects the result. There is only one in any experiment.
Dependent Variable
The variable that is measured or counted; it gets affected by independent variable; there is only one in any experiment.
Extraneous Variable
Variables that are constant, or the same, and do not affect results; there are many in any experiment.
Variable Design
Identifies the variables in the experiment.
Label each variable as independent, dependent or extraneous.
Materials List
A list of all the materials and the amounts of each material necessary to carry out the experiment.
Procedure
A step-by step list of instructions for carrying out the experiment.
Should be so detailed that someone else could run the same experiment and get the same results.
Data Table
Used to organize the data that is collected during the experiment.
Shows the changes the scientist makes to the independent variable.
Shows the measurements taken for the dependent variable.
Needs a clear title and headings.
Graphs
A visual representation of the data that was collected during the experiment.
Bar Graphs
Used to show changes in data that are quantitative or to show comparison.
Line Graphs
Used to show changes in data that are successive or change over a period of time.
Positive Relationship
Both variables increase or decrease together (positive slope)
Negative Relationship
As one variable increases, the other decreases (negative slope)
No Relationship
As independent variable changes, dependent variable stays the same (no slope)
Analysis
A paragraph that discusses the experiment.
Includes detailed description of the data collected.
Explains if the hypotheses was confirmed or disproved (or was the question answered)
Includes sources of error in the experiment.
Looks at what could be tested using the variables again in a different experiment.
Does not use personal pronouns (I, me, my)