Science Vocabulary

Term Definition
Mean The sum of the number in a set of data divided by the number of items in the set.
Median The middle number in a data set when the data is arranged in numerical order.
Mode The number that appears most often in a data set.
Range The difference between the highest and lowest values in a data set.
Controlled experiment A scientific experiment that involves changing one factor and observing its effect on one thing while keeping all other things constant.
Independent variable The variable that is changed in an experiment.
Dependent variable The variable that changed as a result of a change in the independent variable.
Scientific method A series of steps that scientists use when performing an experiment.
Hypothesis An explanation that can be tested with a scientific investigation.
Data Information gathered during an investigation; recorded in the form of descriptions, tables, graphs, or drawings.
Conclusion A statement about whether or not the hypothesis is valid based on the data collected.
Quantitative data Descriptions of the natural world using numbers.
Qualitative data Descriptions of the natural world using words.

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