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GMS GIfted 7 List 1
Experimental Design
20
Science
7th Grade
09/02/2008

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Term
Experimental Design Method
Definition
A systematic method of investigation using experimentation, observation, and deductive reasoning (making inferences.)
Term
Qualitative Observations
Definition
observations using the five senses
Term
Quantitative Observations
Definition
observations using numbers, measuring tools, and amounts
Term
Inference
Definition
an interpretation or explanation using observations and prior knowledge
Term
Hypothesis
Definition
a possible explanation for observations that relate to a scientific question
Term
Variable
Definition
any factor in an experiment that can change
Term
Manipulated (independent) Variable
Definition
the variable that the experimenter changes
Term
Responding (dependent) Variable
Definition
the variable that changes as a result of the independent variable being changed; a response
Term
Constants
Definition
the variables that remain the same each time the experiment is conducted
Term
Repeated Trials
Definition
the number of times an experiment is repeated ... to eliminate errors
Term
Test Group
Definition
the group(s) that receive special treatment or are changed in some way
Term
Control Group
Definition
the group that the others are compared to or the group that receives no special treatment
Term
Experimental Error
Definition
mistakes that skew the results that are unrelated to the variable that was manipulated
Term
Data
Definition
facts, figures, and other evidence gathered through observation
Term
Data Analysis
Definition
finding the mean, median, mode, and best from the data collected. Explanation of skewed data and possible reasons for experimental errors
Term
Mean
Definition
the average of the data ... add the numbers and divide by the number of data collected
Term
Median
Definition
the middle number ... rank the data from smallest to largest and choose the middle ... if an even amount, average the two in the middle
Term
Mode
Definition
the most frequently occuring number in a set of data
Term
"Best"
Definition
an average of the mean median and mode
Term
Scientific Theory
Definition
a well tested scientific concept that explains a wide range of observations
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