Intro to Statistics (1.1)

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

• 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 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.

A portion or part of a population is called a

• Random survey

• Sample

• Tally

• Frequency distribution

Identify the population:

A survey of 500 adults in the U.S. found that 54% drink coffee daily.

• A collection of the 500 adults surveyed

• Collection of all adults in the U.S.

• 54%

• 500

Identify the sample:

A survey of 500 adults in the U.S. found that 54% drink coffee daily.

• A collection of the 500 adults surveyed

• Collection of all adults in the U.S.

• 54%

• 500

The costs of items in a shopper's grocery cart represent (a)   data.

A national survey asked 1261 U.S. adult fast-food customers which meal (breakfast, lunch, dinner, snack) they ordered. What is the variable?

• meal

• U.S. adult fast-food customers

• 1261 U.S. adult fast-food customers

• national survey

A national survey asked 1261 U.S. adult fast-food customers which meal (breakfast, lunch, dinner, snack) they ordered. Is the variable qualitative or quantitative?

• quantitative (discrete)

• qualitative (continuous)

• qualitative