CHAPTER 11—COMPARISONS INVOLVING
PROPORTIONS AND A TEST OF INDEPENDENCE
MULTIPLE CHOICE
1.
When developing an interval estimate for the difference between two population proportions, with
sample sizes of n
1
and n
2
,
a.
n
1
must be equal to n
2
b.
n
1
must be smaller than n
2
c.
n
1
must be larger than n
2
d.
n
1
and n
2
can be of different sizes,
ANS:
D
PTS:
1
TOP:
Interval Estimation
2.
If we are interested in testing whether the proportion of items in population 1 is significantly
less
than
the proportion of items in population 2, the
3.
If we are interested in testing whether the proportion of items in population 1 is
larger
than the
proportion of items in population 2, the
4.
Assume we are interested in determining whether the proportion of voters planning to vote for
candidate C (P
C
) is significantly
less
than the proportion of voters planning to vote for candidate B
(P
B
). The correct
null hypothesis
for testing the above is
5.
Assume we are interested in determining whether the proportion of voters planning to vote for
candidate C (P
C
) is significantly
more
than the proportion of voters planning to vote for candidate B
(P
B
). The correct
alternative hypothesis
for testing the above is
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a.
Ha: P
C
 P
B
0
b.
Ha: P
C
 P
B
> 0
c.
Ha: P
C
 P
B
<
0
d.
Ha: P
C
 P
B
≤
0
ANS:
B
PTS:
1
TOP:
Hypothesis Testing
6.
The sampling distribution of
1

2
is approximated by a
7.
If a hypothesis is rejected at 95% confidence,
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 Spring '10
 Alwes,C
 Calculus, Null hypothesis, Hypothesis testing, Statistical hypothesis testing

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