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17 terms

Science NOS Quiz 1

the investigation and exploration of natural events and of the new information that results from those investigations
simplified representation of a system
field study
a scientific study of free-living plants and animals in which the subjects are observed in their natural habitat without changing, harming, or altering the setting or subjects
systematic observation
the skill of recognizing and noting some fact or event in the the natural world
controlled experiment
a lab investigation in which the values of all variables are kept the same except for one that is changed from experiment to experiment
the imitation of some real thing, situation, or process
the results of using one or more of your senses to gather information and taking note of what occurs
a logical explanation of an observation that is drawn from prior knowledge or experience
any factor that can have more than one value
independent variable
the factor that you want to test that is changed by the investigator to observe how it affects a dependent variable
dependent variable
the factor you observe or measure during an experiment
experimental group
used to study how a change in the independent variable changes the dependent variable
control group
contains the same factors as the experimental group, but the independent variable is not changed
why we hypothesize
-know what you're going to prove
-know what you're going to learn
-have an idea of what is to be tested
-research (background)
control group the independent variable isn't changed
How is the control group different from an experimental group?
repeat several times to confirm hypothesis
what do you do if your hypothesis is supported?
modify and revise hypothesis then test it again
what do you do if your hypothesis is not supported?