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What is the name for the ways that scientists perform investigations?

scientific methods

What two things do all scientific methods use?

logic and reasoning

An investigation in which all of the conditions are controlled. Scientists study what happens to a group of samples that are all the same except for one difference.

an experiment

What are the three types of scientific methods/investigations?

Experiments, reapeated observations, and using models

Scientists use this to study processes in nature that they can observe but can't control

Repeated observations

Scientists use this when they can not experiment on the real thing. They help scientists investigate things that are large (like planets), expensive (like a bridge), or uncontrollable (like the weather).

Models

Which method would a scientist use to determine how different bridge designs react to strong winds?

Model

Which method would a scientist use to determine how fast the wind blows where a bridge will be built?

repeated observations

Which method would a scientist use to determine which type of paint works best to keep a bridge from rusting?

experiments

How does a hurricane affect animals? Are coral reefs dying? How do whales raise their young? These are examples of scientific questions that can be answered through which method?

Repeated observation

How does a bat fly? Why might Saturn's rings look close up? How does a heart work? These are examples of scientific questions that can be answered through which method?

models

This method is used to understand systems that have many hidden parts.

models

Which method can sometimes use computers?

models

This is a procedure used to test a hypothesis

experiment

A statement that can be tested and will explain what can happen in an investigation

hypothesis

Any condition in an experiment that can be changed

Variable

the setup in an experiment to which you will compare the others

the "control"

Diagrams and flow charts are examples of...

models

This is a data display used to show change over time, especially small changes

line graph

This is a data display suited to comparing parts to the whole

circle graph

This is a data display suited to show data that does not include numbers

diagrams

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