CHAPTER 1
WHAT IS STATISTICS?
1.
a.
b.
c.
d.
e.
f.
Interval
Ratio
Interval
Nominal
Ordinal
Ratio
2.
a.
b.
c.
d.
Ratio
Nominal
Ratio
Ratio
3.
Answers will vary
4.
a.
b.
c.
d.
5.
Qualitative data is not numerical, whereas quantitative data is numerical. Examples will
vary by student.
6.
A population is the entire group which you are studying. A sample is a subset taken from
a population.
7.
Discrete variables can assume only certain values, but continuous variables can assume
any values within some range. Examples will vary
8.
a.
b.
c.
d.
Sample
Population
Population
Sample
A sample is used because it is difficult to locate every student.
A population is employed because the information is easy to find.
A population is used because the information is easy to find.
A sample works because it is difficult to locate every musical.
9.
Qualitative
Quantitative
Nominal
Ordinal
Chapter 1
Discrete
b. Gender
d. Soft drink preference
f. SAT scores
g. Student rank in class
h. Rating of a finance professor
Continuous
Discrete
b. Gender
Continuous
d. Soft drink preference
g. Student rank in class
h. Rating of a finance professor
6
a. Salary
c. Sales volume of MP3 players
e. Temperature
i. Number of home computers
Interval
Ratio
f. SAT scores
e. Temperature
a. Salary
c. Sales volume of MP3 players
i. Number of home computers
10.
Answers will vary
11.
As a result of these sample findings, we can conclude that 120/300 or 40 percent of the
white-collar workers would transfer outside the U.S.
12.
The obvious majority of consumers tested (400/500, or 80%) believe the policy is fair.
On the strength of these findings, we can anticipate a similar proportion of all customers
to feel the same.
13.
a. Yes, every company has increased sales.
b. GM market share increased 9% while Ford lost 6% and Chrysler lost 3%.
14.
There was a large decrease in 2002, but earning generally have increased.
15.
Answers will vary.
16.
a.
b.
Township is qualitative variable, the others are quantitative.
Township is nominal level variable, the others are ratio level variables.
17.
a.
b.
Grass or turf field is a qualitative variable, the others are quantitative.
Grass or turf field is a nominal level variable, the others are ratio level variables.
18.
a.
Wage, education, experience, and age are quantitative variables. The others are
qualitative.
Wage, education, experience, and age are ratio level variables. The others are
nominal.
b.
19.
a.
b.
G-20 and petroleum are qualitative variables. The others are quantitative.
G-20 and petroleum are nominal level. The other variables are ratio.
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Chapter 1