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CHAPTER 1
USES AND ABUSES
CHAPTER 2
USES AND ABUSES
1. Answers will vary.
CHAPTER 3
USES AND ABUSES
1. (a) P(winning Tuesday and Wednesday) = P(winning Tuesday) · P(winning Wednesday)
11
1000 1000
0.000001
⎛⎞⎛⎞
⎟⎟
⎜⎜
=⋅
⎟⎟
⎜⎜
⎟⎟
⎜⎜
⎝⎠⎝⎠
=
2. Answers will vary.
P(pickup or SUV) < 0.55 because P(pickup) = 0.25 and P(SUV) = 0.30, but a person may own
both a pickup and an SUV (i.e. not mutually exclusive events). So, P(pickup and SUV) > 0 and
this probability would have to be subtracted from 0.55.
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CHAPTER 4
USES AND ABUSES
1. 40
P(40) ≈ 0.081.
CHAPTER 5
USES AND ABUSES
1. 100
15
µ
σ
=
=
(a) 115 100 1.73
15
3
x
z
n
µ
σ
−−
== ≈
CHAPTER 6
USES AND ABUSES
1. Answers will vary
2. Answers will vary.
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CHAPTER 7
USES AND ABUSES
1. Randomly sample airports and gather data necessary to answer question. (Answers will vary.)
CHAPTER 8
USES AND ABUSES
1. Age and health. (Answers will vary.)
CHAPTER 9
USES AND ABUSES
1. Answers will vary.
2. Answers will vary. Sample answer: One example would be temperature and output of sulfuric
acid. When sulfuric acid is manufactured, the amount of acid that is produced depends on the
temperature at which the industrial process is run. As the temperature increases, so does the
534 USES AND ABUSES │
CHAPTER 10
USES AND ABUSES
1. Answers will vary. Sample answer: An example would be a biologist who is analyzing
effectiveness of three types of pesticides. The biologist sprays one pesticide on five different
2. Answers will vary. Sample answer: An example would be another biologist who is analyzing the
effectiveness of three types of pesticides. He has fifteen acres to test. He randomly assigns each
pesticide to five acres and treats all of the acres for three weeks. At the end of three weeks, the
biologist calculates the mean number of insects for each of the pesticides. He wants to determine
whether there is a difference in the mean number of insects per acres.
CHAPTER 11
USES AND ABUSES
1. Answers will vary. Sample answer:
0:H median ≥ 10
:
a
H median < 10
2. Nonparametric test Parametric test
(a) Sign test z-test or t-test
(b) Paired sample sign test t-test