IEE 380 Summer 2009
Name: _____________________________
Quiz #9A
In a poll of 50 people, 12 said that they would vote for Candidate A over Candidate B in an election.
Is
there evidence that the proportion of people voting for Candidate A is not .25?
Clearly state your
conclusion and show all work.
Use
α
= .01.
What is the pvalue?
pvalue = 2
Φ
(z
0
) = 2(.436) = .872
( 29
0
005
.
0
.005
.005
0
0
0
1
0
H
reject
to
fail
we
z
z

Since
58
.
2
z
16
.
)
75
)(.
25
(.
50
)
25
)(.
50
(
12
1
25
.
:
25
.
:
z
p
np
np
x
z
p
H
p
H
<
<
=

=

=


=
≠
=
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Name: _____________________________
Quiz #9B
In a poll of fifty people, twelve said that they would vote for Bob over all other candidates in an election.
Is there evidence that the proportion of people voting for Bob is less than .25?
Clearly state your
conclusion and show all work. Use
α
= .01.
What is the pvalue?
Φ
(z
0
) = .436
( 29
0
0
.01
.01
0
0
0
1
0
H
reject
to
fail
we
z
z

Since
33
.
2
z
16
.
)
75
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 Summer '09
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 IEE, State your conclusion

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