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STA 3024 Summer A 2011
Exam 1 (Form Code X)
Name:
UFID:
This is
75
minutes exam. You have to answer
20
multiple choice questions. Each question
is worth
5
points that makes the whole exam worth
100
points. There is only
one
correct
answer for each question. You need to
bubble the correct answer
on the scantron to get
credit. Only scantron and
not this exam
will be graded. You have to turn in both exam
and scantron. You can use a calculator but you cannot use any supplemented materials
not included in this exam.
•
On
this paper
, write your
name and UFID
. You also need to
sign and date this exam
below
.
•
On your
scantron
, bubble your
name, UFID, and exam Form Code
(please see upper right
corner of this page for your form code.) You also need to bubble your
section number
which
is
1053
. There are no special codes.
•
A formula sheet and chisquared table are provided on the last page.
On my honor I have neither received or given or planning to give any aid on this exam as
well as disclose its contents to the ones who is going to take it after me.
Name:
DATE:
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View Full Document1.
Sample odds ratio.
Calculate the sample odds ratio for the conditional proportions shown
below. (HINT: Use the formula from the formula sheet)
Response
Gender
Yes
No
Total
Female
0.333
0.667
1.000
Male
0.184
0.816
1.000
(A) 1.479
(B) 1.810
•
2.214
(C) 4.435
(D) 8.883
2.
Probability and Independence.
Consider the probability space that is represented by the
single toss of the die. That is the set of outcomes is
Ω =
{
1
,
2
,
3
,
4
,
5
,
6
}
and the probability of
each outcome is equal to
1
6
. Now consider the following events.
A
=
{
1
,
3
,
5
}
i. e.
A
stands
for odd numbers.
B
=
{
1
,
2
,
3
,
4
,
5
,
6
}
i.e.
B
stands for any number from
1
to
6
including
1
and
6
.
C
=
{
1
,
2
,
3
}
i. e.
C
stands for getting
1
,
2
or
3
. Please identify the pairs of independent
events out of the three events mentioned above using the
definition formula of independence
.
Please note that all outcomes in
Ω
are
equally
likely. (HINT: Notice that
P
(
B
) = 1
. Then try
to remember what is the intersection for our case.)
(A) Pair (
A
and
B
) only.
(B) Pair (
A
and
C
) only.
(C) Pair (
A
and
B
) and pair (
A
and
C
).
•
Pair (
A
and
B
) and pair (
C
and
B
).
(D) All three possible combinations i.e. (
A
and
B
), (
A
and
C
) and (
C
and
B
).
3.
Complements.
(
≈
Example 1.8 from the notes) We randomly draw one card from a standard
52
card deck. Let
A
be the event of drawing a spade. What is the complement event for
A
?
That is you are required to identify the the complement event
A
c
.
(A)
A
c
stands for drawing a face card (
K
,
Q
, or
J
).
(B)
A
c
stands for the event of drawing both a spade and a face card.
(C) both (A) and (B) above but not (D) or (E) below.
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 Summer '08
 TA
 Statistics

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