Scientific Experiments

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Scientific Experiments 2018-01-22T12:32:48+00:00

An experiment is a special type of scientific investigation that is performed under controlled conditions, usually in a laboratory.

Some experiments can be very simple, but even the simplest can contribute important evidence that helps scientists better understand the natural world.

Variables
An experiment generally tests how one variable is affected by another. The affected variable is called the dependent variable.
In the plant experiment shown above, the dependent variable is plant growth.
The variable that affects the dependent variable is called the independent variable.

Sample Size and Repetition
The sample in an experiment or other investigation consists of the individuals or events that are studied, and the size of the sample (or sample size) directly affects the interpretation of the results.

Super Microscopes
Microscopes are arguably one of the most important tools of the biologist. They allow the visualization of smaller and smaller biological organisms and molecules. With greatly magnified powers, these instruments are becoming increasingly important in modern day research.

Summary
An experiment is a special type of scientific investigation that is performed under controlled conditions, usually in a laboratory.
An experiment generally tests how one variable is affected by another.
The sample size in an experiment directly affects the interpretation of the results.
Repetition is the repeating of an experiment, validating the results.

 

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