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Hypotheses and Models

During this segment, we introduce two Science and Engineering Practices: Generating a Hypothesis and Developing a Model.

Teacher and students discuss possible reasons for the deaths of the fish in the Ogeechee River. Host introduces the Science and Engineering Practice: Generating a Hypothesis and Developing a Model.

Premiere Date: July 10, 2016 | Runtime: 00:05:38

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Science & Engineering Practices

Generating a Hypothesis and Developing a Model

Modeling can begin in the earliest grades, with students’ models progressing from concrete “pictures” and/or physical scale models (e.g., a toy car) to more abstract representations of relevant relationships in later grades, such as a diagram representing forces on a particular object in a system. (NRC Framework, 2012, p. 58)

Vocabulary

 constant - also known as the controlled variable, any factor that is kept the same during an experiment. 

hypothesis - a tentative explanation or prediction that can be tested by further investigation. 

manipulated variable - also know as the independent variable, the one factor that changes within an experimental group.

meniscus - the curved surface at the top of the liquid in a tube. 

model - a physical, conceptual, or mathematical representation of a real phenomenon whose purpose is to explain and predict what happens in real life. 

observation - any information gathered using any of your five senses or lab instruments.

qualitative data - measurements that do not include numbers.

quantitative data - measurements that include numbers.

replication - data collected by different teams from samples gathered at the same location. 

responding variable - also known as the dependent variable, the variable that is being measured as a result of the experiment. 

significant figures - a term that represents the precision of a measurement. 

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