What is Statistics?

True / False Questions

1. A population is a collection of all individuals, objects, or measurements of interest. True False

2. A sample is a portion or part of the population of interest. True False

3. To infer something about a population, we usually take a sample from the population. True False

4. The techniques used to find out something about a population, such as their average weight, based on a sample are referred to as descriptive statistics. True False

5. There are four levels of measurement-qualitative, quantitative, discrete, and continuous. True False

6. The ordinal level of measurement is considered the "lowest" level of measurement. True False

7. A store asks shoppers for their zip code to identify market areas. Zip codes are an example of ratio data. True False

8. An ordinal level of measurement implies some sort of ranking. True False

9. Data that can only be classified into categories is measured with a nominal scale. True False

10. The terms descriptive statistics and inferential statistics can be used interchangeably. True False

11. A marketing research agency was hired to test a new DVD player. Consumers rated it outstanding, very good, fair or poor. The level of measurement for this experiment is ordinal. True False

12. The Union of Electrical Workers of America with 9,128 members polled 362 members about a new wage package that will be submitted to management. The population is the 362 members. True False

13. The CIA World Factbook cited these numbers for the U.S: ( Birthrate is 14.14 births per 1,000 population

( Average life expectancy for females is 80 years

( Approximately 290 million persons residing in the United States Each of these numbers is referred to as statistic.

True False

14. If we select 100 persons from 25,000 registered voters and question them about candidates and issues, the 100 persons are referred to as the population. True False

15. Statistics is defined as a body of techniques used to facilitate the collection, organization, presentation, analysis and interpretation of information for the purpose of making better decisions. True False

16. Another name for inductive statistics is descriptive statistics. True False

17. Categorizing voters as Democrats, Republicans and Independents is an example of interval level measurement. True False

18. The order that runners finish in a race would be an example of continuous data. True False

19. Based on a sample of 3,000 people, the civilian unemployment rate in the United States was 5.5%. 5.5% is referred to as a statistic. True False

20. The principal difference between the interval and ratio scale is that the ratio scale has a meaningful zero point. True False

21. The branch of mathematics used to facilitate the collection, organization, presentation, analysis and interpretation of numerical data is referred to as a statistic. True False

22. The number of children in a family is a discrete variable. True False

Multiple Choice Questions

23. The main purpose of descriptive statistics is to:

A. Summarize data in a useful and informative manner.

B. Make inferences about a population.

C. Determine if the data adequately represents the population. D. Gather or collect data.

24. Which of the following is an example of a continuous variable? A. Family income

B. Number of students in a statistics class

C. Zip codes of shoppers

D. Rankings of baseball teams in a league

25. The incomes of a group of 50 loan applicants are obtained. Which level of measurement is income? A. Nominal

B. Ordinal

C. Interval

D. Ratio

26. When TV advertisements report "2 out of 3 dentists surveyed indicated they would...