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# Experimental Design - PowerPoint PPT Presentation

Experimental Design. ????????????????????????????. What’s the question. Hypothesis. If-then statement If part - shows a relationship (can be cause-effect) Then part – is your prediction

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## PowerPoint Slideshow about ' Experimental Design' - trenton-dempsey

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Presentation Transcript

• What’s the question

• If-then statement

• If part - shows a relationship (can be cause-effect)

• Then part – is your prediction

• If the texture/pattern of a paper towel affects the rate at which it picks up water, then a paper towel with more indentations and therefore surface area will pick up water the fastest.

• To test only one variable

• All other variables are constant

• Example: To test which fertilizer is the most effective, the variable is the type of fertilizer.

• What should you keep constant?

• Control Group – Where all factors are standard or kept the same. This is what you will compare your experimental group to

• Experimental (Variable) Group – All conditions are kept constant EXCEPT for the variable

A

B

D

C

What group is the control group?

• Independent (Manipulated) Variable – The factor that you deliberately change (fertilizer)

• Dependent (Responding) Variable – The factor that changes in response to the manipulated variable (plant growth)

A

B

D

C

What group is the control group?

• Data- the more trials or the larger the sample size, the more reliable your data will be.

• Quantitative- numerical data

• Qualitative- descriptive data

• Your data will need to be organized so that the result is clear.

Beaker Test Tube Pipette

Which is the most precise?

Meniscus quantity being measured

An experiment needs… quantity being measured

• Conclusions- your experimental results need to be communicated to

• Hypothesis- quantity being measured the prediction and the thinking behind your prediction

• For example: Fertilizer A will be the most effective in aiding plant growth because it contains the most nutrients.

• Theory- after many hypotheses have been tested and have not been proven incorrect, the hypotheses will become a part of a theory.

• Theory- quantity being measured

• How have you heard this word used in “the real world”?

• Why is it important that we know the scientific definition?

• Law- quantity being measured a mathematical explanation of a repeated occurrence (gravity, etc.)