hw 7 - 
 Homework
Assignment
7
 Psychology
60
...

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Unformatted text preview: 
 Homework
Assignment
7
 Psychology
60
 Spring
2010
 
 
 
 General
Instructions:
 ‐ Make
sure
your
homework
has
written
on
it:
 o YOUR
NAME
 o YOUR
STUDENT
ID
 o YOUR
TA’S
NAME
(you
can
find
this
on
the
syllabus)
 
 ‐ Please
be
sure
your
homework
answers
are
LEGIBLE.
 
 ‐ For
homework
problems
requiring
calculation,
you
must
show
all
of
your
work,
 including
intermediate
steps,
in
order
to
receive
credit.


 ‐ Please
circle
final
answers
to
problems
that
require
computation;
doing
this
will
make
sure
 we
can
find
your
final
answer.

 ‐ For
questions
requiring
a
short
written
answer,
be
as
concise
as
possible
while
still
 explaining
your
answer.

 
 ‐ If
you
have
questions
about
concepts,
feel
free
to
post
questions
on
the
class
discussion
 board.
You
may
also
email
your
TAs,
but
do
so
only
after
you
have
looked
through
the
book
 for
an
answer
to
your
question.

 ‐ Homework
is
due
when
you
turn
in
your
midterm
 
 
 1) A
sample
of
n
=
16
individuals
participates
in
a
repeated‐measures
study
that
produces
a
sample
 mean
difference
of
 X D = 9 
with
SS
=
960.

 a. Calculate
the
variance
for
the
sample
of
difference
scores.
 b. Briefly
explain
what
the
measured
by
the
variance
of
difference
scores
 c. Calculate
the
estimated
standard
error
for
the
sample
mean
difference
 d. Briefly
explain
what
is
measured
by
the
estimated
standard
error
in
this
situation
 
 
 2) The
following
data
are
from
a
repeated‐measures
study
examining
the
effect
of
a
treatment
by
 measuring
a
group
of
n
=
4
participants
before
and
after
they
receive
treatment.
 
 Participant
 
 Before
 After
 
 A
 
 
 7
 
 10
 
 B
 
 
 6
 
 13
 
 C
 
 
 9
 
 12
 
 D
 
 
 5
 
 8
 
 a. Calculate
the
difference
scores
and
 X D 
 b. Compute
the
SS
for
the
difference
scores
 c. Compute
the
sample
variance
for
the
difference
scores
 d. Compute
the
estimated
standard
error
of
the
difference
scores
 e. Compute
 t XD 
 f. Is
there
a
statistically
significant
treatment
effect?
Use
a
non‐directional
hypothesis
test
 with
 α = 0.05 
 
 
 3) A
researcher
uses
a
matched‐samples
design
to
investigate
whether
single
people
who
own
pets
 are
generally
happier
than
single
people
without
pets.
A
mood
inventory
questionnaire
is
 administered
to
a
group
of
20‐
to
29‐year
old
non‐pet
owners
and
a
similar
age
group
of
pet
 owners.
The
pet
owners
are
matched
one‐to‐one
with
the
non‐pet
owners
for
income,
number
 of
close
friendships
and
general
health.
The
data
are
as
follows.
 
 Matched
Pair
 Before
 After
 
 A
 
 
 11
 
 13
 
 B
 
 
 9
 
 8
 
 C
 
 
 11
 
 14
 
 D
 
 
 13
 
 13
 
 E
 
 
 6
 
 12
 
 F
 
 
 9
 
 11
 
 a. Is
there
a
statistically
significant
difference
in
the
mood
scores
for
non‐pet
owners
versus
 pet
owners?
Use
a
non‐directional
hypothesis
test
with
 α = 0.05 
 b. Write
a
sentence
describing
the
outcome
of
the
hypothesis
test
as
it
would
appear
in
a
 research
report
 c. Why
does
the
matching
of
subjects
in
this
way
increase
the
power
of
this
test?
 
 4) A
repeated‐measures
study
and
an
independent‐measures
study
both
produced
a
t
statistic
with
 df
=
16.

How
many
individuals
participated
in
each
study?
 
 
 5) A
matched‐subjects
study
and
an
independent‐measures
study
both
produced
a
t
statistic
with
 df
=
16.

How
many
individuals
participated
in
each
study?
 
 
 6) A
researcher
conducts
a
research
study
comparing
two
treatment
conditions
and
obtains
30
 scores
in
each
treatment.

If
the
researcher
used
a
repeated‐measures
design,
then
how
many
 individuals
participated
in
the
research
study?
 
 
 7) Briefly
explain
the
advantages
and
disadvantages
of
using
a
repeated‐measures
design
as
 opposed
to
an
independent‐measures
design.
 
 ...
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This note was uploaded on 07/26/2010 for the course PSYC PSYC 60 taught by Professor ? during the Spring '09 term at UCSD.

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