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149
Solutions to Exercises in Chapter 9
Solution to Exercise 9.1 (p. 140)
Complete solutions to all parts of this problem are available on the instructor’s website for this class.
a.
H
o
:
μ
=
34 ;
H
a
:
μ
6
=
34
c.
H
o
:
μ
≥
100, 000 ;
H
a
:
μ
<
100, 000
d.
H
o
:
p
=
0.29 ;
H
a
:
p
6
=
0.29
g.
H
o
:
p
=
0.50 ;
H
a
:
p
6
=
0.50
i.
H
o
:
p
≥
0.11 ;
H
a
:
p
<
0.11
Solution to Exercise 9.2 (p. 140)
Complete solutions to all parts of this problem are available on the instructor’s website for this class.
a.
Type I error: We believe the average is not 34 years, when it really is 34 years. Type II error: We
believe the average is 34 years, when it is not really 34 years.
c.
Type I error: We believe the average is less than $100,000, when it really is at least $100,000. Type II
error: We believe the average is at least $100,000, when it is really less than $100,000.
d.
Type I error: We believe that the proportion of h.s. seniors who get drunk each month is not 29%,
when it really is 29%. Type II error: We believe that 29% of h.s. seniors get drunk each month,
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 Fall '08
 Ripol
 Statistics

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