27 terms

# Dependent and Independent Variables

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variables
used in math and science; something that CAN be changed
constant
something that CANNOT change
manipulate/independent variable
one factor changed by the person doing the experiment; "manipulated variable"
response/dependent variable
factors being measured in an experiment; changes in response to the changes in the independent/manipulated variable; also known as the "response variable"
constants
factors that stay the SAME in an experiment
What does a scientist do after she manipulates (changes) the manipulated (independent) variable?
observes
Where is the manipulated/independent variable usually plotted?
On the X-axis of a graph
response/dependent variable
dependent variable; responds to changes in other variables in the experiment; the factor being measured in an experiment (what is observed AFTER the experiment)
manipulated/independent variable
independent variable; the one factor that is changed by the person doing the experiment (what we know before the experiment)
Where is the dependent/response variable usually plotted?
On the Y-axis of a graph
controlled variables
quantities that a scientist wants to remain the same (constant); must be observed as CAREFULLY as the response variables
Experimental Scientific Method
a set of scientific processes that scientists use to answer questions and solves problems in the world around them (cause/effect relationships)
Experiment
an investigation designed to find out how variables affect outcomes or results
Variable
anything that can change in an experiment that might affect the outcome
Controlled Experiment
an experiment in which ONE variable is changed and the outcome is compared to a standard (control)
Standard or Control
the basic procedure used in a controlled experiment, before changing any of the variables
Hypothesis
an educated guess/prediction based on information and experience
Data
pieces of information collected in an experiment/investigation
Repeated Trials
Experimental tests done more than once.
Conclusions
a statement that describes what an experiment/investigation showed, based on observations and data
Two-Coordinate Graph
shows the outcome of a series of experiments when a variable is changed by increment (steps)
X-axis
the horizontal axis on a graph (independent/manipulated variable)
Y-axis
the vertical axis on a graph (dependent/response variable)
Pendulum
a mass hung from a fixed point, free to swing back and forth when put into motion (grandfather clock, swing)
Cycle
any motion of an object that periodically repeats (example: one full swing of the pendulum=one cycle)
Mean or Average
usual; typical; MIDDLE
System
a set of parts that are related in some way and work together (a part can be isolated in a controlled experiment)