ap bio scientific method
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30 Terms
first step of scientific method
observe
second step of scientific method
research, use info to make educated guess
research must be
factual, testable
research does not
directly answer question
research gives you
background information about a topic
3rd step of scientific method
use research for hypothesis
hypothesis is
educated guess, based off of research
alternate hypothesis sign
Ha
null hypothesis sign
Ho
an alternate hypothesis is…
your “typical” hypothesis, guess
a null hypothesis is…
opposite of alternate hypothesis… what you would expect if Ha is FALSE
step 4 of scientific method
create + perform an experiment
creating/performing experiment involves:
defining variables, figuring out WHAT ur going to test
independent variable
what ur trying to test
only variable that ur trying to test
independent variable
dependent variable
measured effects of independent variable
another name for controlled variable
constant
a controlled variable is…
experimental condition that should be maintained the same to maximize accuracy
positive control group
receives alternate treatment that is known to work/be effective
negative control group
does not get the treatment (in all experiments); sometimes gets placebo
experimental group
group that receives independent variable
step 5
record and analyze data
after doing step 5, if your data supports your hypothesis
go to step 7 and 8
after doing step 5, if your data does not support your hypothesis
ask yourself: “is the data inaccurate” ?
after doing step 5 and you find that your data IS inaccurate
go to step 6: modify the experiment
step 6 of scientific method
modify experiment
modify the experiment
rewrite procedure to fix where u went wrong in original experiment
after doing step 5 and you find that your data is not inaccurate
go to step 7 and 8
step 7 of scientific method
communicate results by writing a conclusion that summarizes results + answers main question
step 8 of scientific method
repeat the experiment for improved accuracy