Chapter 01 - What is Statistics?
3.
4.
5.
1.
2. a. c. e. a. c.
Interval
Interval
Ordinal
Ratio
Ratio
Answer will vary. a. c.
Sample
Population b. d. f. b. d. b. d.
Ratio
Nominal
Ratio
Nominal
Ratio
Population
Sample
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.
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. a. b. c.
Ordinal
Ratio
The newer system provided information on the distance between exits.
10. The cell phone provider is nominal level data. The minutes used are ratio level. Satisfaction is ordinal level.
11. If you were using the Ridgedale Mall store as typical of all Gap stores then it would be sample data. However, if you were considering it as the only store of interest, then the data would be population data.
12 In a presidential election all votes are counted, thus it is similar to a census of the entire population. However, an “exit” poll consists of only some voters and thus is more like a sample of the entire population.
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Chapter 01 - What is Statistics?
13.
Qualitative
Discrete b. Gender
Continuous d. Soft drink preference
Quantitative f. SAT scores g. Student rank in class a. Salary c. Sales volume of MP3 players h. Rating of a finance professor e. Temperature
Nominal
Ordinal
Discrete b. Gender d. Soft drink preference i. Number of home computers
Continuous
Interval
Ratio g. Student rank in class h. Rating of a finance professor e. Temperature a. Salary c. Sales volume of MP3 players
14. Answers will vary. i. Number of home computers
15. As a result of these sample findings, we can conclude that 120/300 or 40% of the white-collar workers would transfer outside the U.S.
16. The obvious majority of consumers tests (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.
17. a. b.
The total sales declined about 6% from 1,000,772 to 942,973 units.
General Motors and Ford experienced losses of 17 and 19 percent, respectively.
Meanwhile, Toyota gained about 9 percent. So there has been a significant shift within the market from domestic to foreign manufacturers.
18. The total amount spent is $603.86. The percents by group are: 75, 14, 4, and 7, respectively.
19. Earnings have increase every year over all previous years.
20. a. b.
Township is qualitative variable, the others are quantitative.
Township is nominal level variable, the others are ratio level variables.
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Chapter 01 - What is Statistics?
21. a. b.
22. a. b.
23. 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.
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.
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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