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Key Concepts 8th

8th grade key concepts

TermDefinition
1. Describe the three types of scientific models. • Conceptual models are systems of ideas or analogies to explain an idea. • Mathematical models use equations and data to explain an idea. • Physical models use tangible (touchable) items to visually represent an idea.
2. Distinguish between a theory and a law. • A theory is an explanation that ties together many hypothesis and observations, while a law is when that explanation is proven to be true.
3. Define hypothesis. • A hypothesis is an explanation that is based on prior scientific research or observations and that can be tested.
4. Define mathematical mean. • The average of all the numbers in a data set.
5. Define mathematical median. • The middle number of a data set, when the numbers are arranged in order. If there are two middle numbers, the median is the average of the two.
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