Astudyisbeingconductedonthebehaviorof

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Unformatted text preview: 
more
than
one
thing
 –  Example:
Do
you
find
that
taking
drug
X
improves
your
memory
 and
prevents
drowsiness?
 Sampling
techniques
 •  We
aim
to
get
a
representa$ve
sample
 •  Probability
sampling:
sampling
technique
in
 which
each
member
of
the
popula$on
has
an
 equal
likelihood
of
being
selected
to
be
part
of
 the
sample
 –  Random
selec$on:
example:
hat
method
 –  Stra$fied
random
sample:
Sampling
technique
that
 ensures
that
subgroups
or
strata
are
fairly
represented
 Sampling
techniques,
con$nued
 •  Nonprobability
sampling:
sampling
technique
in
which
 the
individual
members
of
the
popula$on
do
not
have
 an
equal
chance
of
being
selected
as
part
of
a
sample
 –  Convenience
sampling:
geang
par$cipants
wherever
they
 can
be
found,
and
wherever
is
convenient
for
the
 researcher
 –  Quota
sampling:
essen$ally
combines
elements
of
 stra$fied
sampling
and
convenience
sampling.

It
ensures
 that
the
sample
is
representa$ve
of
the
popula$on,
but
 uses
convenience
sampling
to
get
there
 Review
ques$ons
 
A
psychology
student
goes
to
the
playground
to
 observe
children
playing
and
how
they
get
along
 with
other
children.
Which
best
describes
the
 type
of
observa$on?
 
A:
Undisguised
observa$on
 
B:
Par$cipant
observa$on
 
C:
Parallel
observa$on
 
D:
Nonpar$cipant
observa$on
 
Which
of
the
following
is
an
example
of
an
 instrumenta$on
threat
to
validity
in
a
study
 about
the
effects
of
a
weight
loss
pill?
 A.
The
control
group
and
experimental
group
are
 weighed
in
separate
rooms.
 B.
The
control
group
consists
of
women
and...
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