119
e.
0.9742
f.
0.0018
g.
$52,330
h.
$46,634
i.
The distribution would be more concentrated about the mean. According to the CLT, the spread of the
distribution for the sample mean gets smaller when the sample size is increased.
j.
If each teacher received a $3,000 raise, then the population mean would increase by $3,000. The popula
tion mean is at the center of the distribution for the sample mean. So the distribution for the sample
mean would shift $3,000 to the right along the horizontal axis.
Solution to Exercise 7.15 (p. 113)
c.
N
2.4,
0.9
√
80
h.
Individual
Solution to Exercise 7.17 (p. 113)
b.
$20.71; $17.31; 35
d.
Exponential distribution,
X
∼
Exp
(
1/20.71
)
f.
$20.71; $11.14
j.
N
20.71,
17.31
√
5
Solution to Exercise 7.19 (p. 114)
B
Solution to Exercise 7.20 (p. 114)
A
Solution to Exercise 7.21 (p. 114)
D
Solution to Exercise 7.22 (p. 115)
B
Solution to Exercise 7.23 (p. 115)
A
Solution to Exercise 7.24 (p. 115)
C
Solution to Exercise 7.25 (p. 115)
REVIEW QUESTION 1 Solution : A
Solution to Exercise 7.26 (p. 115)
REVIEW QUESTION 1 Solution : B
Solution to Exercise 7.27 (p. 116)
REVIEW QUESTION 3 Solution : A
Solution to Exercise 7.28 (p. 116)
REVIEW QUESTION 4 Solution
a.
0.7165
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 Fall '08
 Ripol
 Statistics, Normal Distribution

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