Exam 1: What Is Statistics

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

The branch of mathematics used to facilitate the collection,organization,presentation,analysis,and interpretation of numerical information is referred to as statistics.

What type of variable is the number of gallons of gasoline pumped by a filling station during a day?

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

An ordinal level of measurement implies some sort of ranking.

The average number of passengers on commercial flights between Chicago and New York City is an example of a statistic.

When statisticians analyze sample data in order to draw conclusions about the characteristics of a population,this is referred to as

When TV advertisements report that "2 out of 3 dentists surveyed indicated they would recommend Brand X toothpaste to their patients," an informed consumer may question the conclusion because

What type of variable is the number of auto accidents reported in a given month?

Descriptive statistics are used to find out something about a population based on a sample.

Which of the following is an example of a continuous variable?

The incomes of 50 loan applicants are obtained. Which level of measurement is income?

If Gallup,Harris,and other pollsters asked people to indicate their political party affiliations as Democrat,Republican,or independent,the data gathered would be an example of which scale of measurement?

Statistics are used as a basis for making decisions.

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.

The number of children in a family is a discrete variable.

The reported unemployment is 5.5% of the population. What measurement scale is used to measure unemployment?

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.

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.

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