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CHAPTER 13 SECTION 4: INFERENCE ABOUT COMPARING TWO
POPULATIONS
MULTIPLE CHOICE
87.
The ratio of two independent chisquared variables divided by their degrees of freedom is:
a.
normally distributed
b.
Student
t
distributed
c.
chisquared distributed
d.
F
distributed
ANS: D
PTS: 1
REF: SECTION 13.4
88. The
F
distribution is the sampling distribution of the ratio of:
89.
Which of the following statements is false for an
F
distribution?
90.
The sampling distribution of the ratio of two sample variances
s
1
2
/
s
2
2
is said to be
F
distributed
provided that:
91.
When testing for the difference between two population variances with sample sizes of
n
1
= 8 and
n
2
=
10, the degrees of freedom are:
a.
8 and 10
b.
7 and 9
c.
2 and 18
d.
18 and 2
ANS: B
PTS: 1
REF: SECTION 13.4
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92.
Which of the following statements is correct regarding the percentile points of the
F
distribution?
93.
In testing for the equality of two population variances, when the populations are normally distributed,
the 10% level of significance has been used. To determine the rejection region, it will be necessary to
refer to the
F
table corresponding to an uppertail area of:
94.
The statistical distribution used for testing the difference between two population variances is the
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 Spring '10
 Kumar
 Normal Distribution, Variance, UCL

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