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

• True

• False

Statistics are used as a basis for making decisions.

• True

• False

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

• True

• False

There are four levels of measurement: qualitative, quantitative, discrete, and continuous.

• True

• False

The ordinal level of measurement is considered the "lowest" level of measurement.

• True

• False

Data measured on a nominal scale can only be classified into categories.

• True

• False

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

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

• True

• False

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

• True

• False

The main purpose of descriptive statistics is to:

• Summarize data in a useful and informative manner.

• Make inferences about a population.

• Determine if the data adequately represents the population.

• Gather or collect data.