Planning Fair Tests - 3rd Grade Science
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What should you do first when planning a fair test for a model or prototype?
What should you do first when planning a fair test for a model or prototype?
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State the problem or question you are trying to solve. Clear goals guide your entire experiment design.
State the problem or question you are trying to solve. Clear goals guide your entire experiment design.
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What should you compare to decide which prototype works best after a fair test?
What should you compare to decide which prototype works best after a fair test?
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The measured results for the dependent variable. Compare what you measured to find the best design.
The measured results for the dependent variable. Compare what you measured to find the best design.
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Which option is the best way to record results from each trial: a data table or memory?
Which option is the best way to record results from each trial: a data table or memory?
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A data table. Tables organize data clearly for analysis.
A data table. Tables organize data clearly for analysis.
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Find and correct the unfair plan: Change ramp height and change ball type in one test.
Find and correct the unfair plan: Change ramp height and change ball type in one test.
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Change only ramp height or only ball type, not both. Fair tests change only one variable at a time.
Change only ramp height or only ball type, not both. Fair tests change only one variable at a time.
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Identify the independent variable: You test which bridge design holds the most pennies.
Identify the independent variable: You test which bridge design holds the most pennies.
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Bridge design. You're testing different designs to compare strength.
Bridge design. You're testing different designs to compare strength.
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Identify the dependent variable: You test which bridge design holds the most pennies.
Identify the dependent variable: You test which bridge design holds the most pennies.
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Number of pennies held before breaking or bending. This measures how strong each bridge design is.
Number of pennies held before breaking or bending. This measures how strong each bridge design is.
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Which option must stay the same to make a bridge test fair: pennies used or bridge design?
Which option must stay the same to make a bridge test fair: pennies used or bridge design?
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Pennies used (same type and added the same way). Same pennies ensure only design affects strength.
Pennies used (same type and added the same way). Same pennies ensure only design affects strength.
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What is a fair test when you are testing a model or prototype?
What is a fair test when you are testing a model or prototype?
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A test where only one variable is changed and others are kept the same. This ensures only one factor affects the results.
A test where only one variable is changed and others are kept the same. This ensures only one factor affects the results.
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What is the independent variable in a fair test for a prototype?
What is the independent variable in a fair test for a prototype?
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The one factor that you change on purpose. You control this to see how it affects the outcome.
The one factor that you change on purpose. You control this to see how it affects the outcome.
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What is the dependent variable in a fair test for a model or prototype?
What is the dependent variable in a fair test for a model or prototype?
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The result you measure or observe. This changes based on what you do to the independent variable.
The result you measure or observe. This changes based on what you do to the independent variable.
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What are controlled variables in a fair test of a model or prototype?
What are controlled variables in a fair test of a model or prototype?
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Factors kept the same each time to make the test fair. These prevent other factors from affecting your results.
Factors kept the same each time to make the test fair. These prevent other factors from affecting your results.
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Which option best describes a testable question for a prototype: opinion or measurable result?
Which option best describes a testable question for a prototype: opinion or measurable result?
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Measurable result. Science tests need numbers or observations, not feelings.
Measurable result. Science tests need numbers or observations, not feelings.
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What is a hypothesis in a fair test for a model or prototype?
What is a hypothesis in a fair test for a model or prototype?
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A prediction of what will happen and why. It's an educated guess based on what you know.
A prediction of what will happen and why. It's an educated guess based on what you know.
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What is one reason you repeat trials when testing a model or prototype?
What is one reason you repeat trials when testing a model or prototype?
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To make results more reliable. Multiple trials help confirm your results are consistent.
To make results more reliable. Multiple trials help confirm your results are consistent.
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Identify the dependent variable: You test which parachute size falls slowest.
Identify the dependent variable: You test which parachute size falls slowest.
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Time to fall (how fast it falls). You measure this to see which parachute works best.
Time to fall (how fast it falls). You measure this to see which parachute works best.
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