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Important terms
Experimental design
| Question | Answer |
|---|---|
| A prediction about the possible relationship between two or more factors (variables) in an experiment. | A ___inference Example: If you increase the amount of light plants receive, the height of plants will also increase. |
| _: Factors that can vary or be change in an experiment. | ____variable____Example: amount of light, type or fertilizer, source of water; type of plant, height of plants. |
| The factor that is purposely changed in the experiment. Variable: | Independent varible |
| The factor that changes as a result of what is purposely changed. | Dependent Variable |
| Factors that are kept the same in the experiment. | constints Example: All plants receive the same amount of water, same type of plant is used, weather conditions are the same for all plants |
| repetition of an experiment using many plants to increase accuracy in the data and thereby reduce the effects of chance or random errors that may occur in a single trial. | Trail is Example: for each color of light, 10 plants are used |
| The group that is used as a standard for comparison in an | Controlled group Example: The group of 10 plants that received no light or those that receive the “normal” amount of light can be designated as the control. |
| The group(s) in which a variable is intentionally changed. | Experimental groups Example: The group(s) of plants that receive different amounts of light. |
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