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Be sure to control your experiment

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Be sure your results can be shown to be statistically significant

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Be sure your results can be shown to be statistically significant

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Correlation vs. Causation

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Must be testable!

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If we (Increase/decrease) the IV then there will be a (increase/decrease) in DV because

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The null hypothesis assumes that there is no meaningful relationship between two variables—may be the most valuable hypothesis for the scientific method because it is the easiest to test using a statistical analysis. This means you can support your hypothesis with a high level of confidence.

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If you were measuring the growth of a plant over time, what would be the best type of graph to illustrate your results?

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What are some characteristics of a good independent variable?

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What are some characteristics of a good independent variable?

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What are things that are characteristics of a good control?

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What are things that are characteristics of a good control?

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An independent variable is something that "I" manipulate.  What I would change to see what happens 

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An independent variable is something that "I" manipulate.  What I would change to see what happens 

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If you were investigating how effective fertilizer was.... what would you change?

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What are things that wouldn't count as a dependent variable?

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What are things that wouldn't count as a dependent variable?

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anything that stays the same throughout the experiment. For example: the same amount of water, the same amount of sunlight, the same pot...you get the point!
What are some other constants you can think of?

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When you do measurements multiple times.
How many times should you repeat an experiment in order to obtain accurate data?

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A Dependent Variable is a variable that will change in response to the change in the independent variable.

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A Dependent Variable is a variable that will change in response to the change in the independent variable.

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I'm a Dr is a great way to remember the I & D variables.

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I'm a Dr is a great way to remember the I & D variables.

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Independent is Manipulated & Dependent Responds.

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is a group that is used for comparison. It does not receive the special treatment.

Mrs. F wanted to test the effects of vinegar on plant growth. She used 10 ml of vinegar in the 1st pea plant, 5 ml of vinegar in the 2nd pea plant, and water in the 3rd pea plant. Identify the control group.