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17 Cards in this Set
- Front
- Back
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scientific methods |
ways that scientists perform investigations. |
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experiment |
an investigation in which all of the conditions are controlled |
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variable |
any condition in an experiment that can be changed |
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control |
the setup to which you will compare all the others |
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predict |
to make a statement, based on information, about a future event |
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3 types of investigations? |
1.experiments 2. repeated observations 3. using models |
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when do you use the type of investigation: experiments? |
use an experiment when you can control all the conditions of the investigations. Study what happens to a group of samples that are all the same except for one difference. |
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when do you use the type of investigation: repeated observations? |
Repeated observations are used to study processes in nature that they can observe but can't control. |
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when do you use the type of investigation: using models? |
Models are used when scientists cannot experiment on the real thing. Helps scientists investigate things that are large, expensive or uncontrollable |
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what are three types of models? |
1. shake table 2. computer simulation 3. two dimensional |
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when is a line graph used? |
show change over time |
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when is a bar graph used? |
compares things or groups of things. Use them when your data is in categories.
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when is a circle graph used? |
they compare parts to the whole. They show fractions and percentages. |
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when is a diagram used? |
shows data that doesn't include numbers. |
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Does a hypothesis need to be testable? |
yes |
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If the results of an experiment don't support a hypothesis, what do you do? |
you should repeat the experiment to check for errors |
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