A
____________________
____________________
is
a
systematic
approach
used
in
scientific
study
to
do
research
or
to
verify
the
work
of
others
.
Usually
,
the
first
type
of
observation
made
by
scientists
are
____________________
____________________
-
information
that
describes
color
,
odor
,
shape
or
some
other
physical
characteristic
.
Scientists
frequently
gather
another
type
of
data
such
as
the
quantity
of
chemical
formed
or
how
much
of
a
chemical
is
used
up
in
a
reaction
.
This
numerical
information
is
called
____________________
____________________
.
A
____________________
is
a
tentative
explanation
for
what
has
been
observed
.
A
hypothesis
means
nothing
unless
there
is
____________________
to
support
it
.
An
____________________
is
a
set
of
controlled
observations
that
test
the
hypothesis
.
In
an
experiment
,
the
____________________
____________________
is
the
variable
that
the
scientist
plans
to
change
.
The
____________________
____________________
value
depends
on
the
independent
variable
.
A
____________________
is
a
standard
for
comparison
.
Scientists
take
the
data
that
have
been
analyzed
and
apply
them
to
the
hypothesis
to
form
a
____________________
.
