Question

The World Health Organization wishes to estimate the mean density of people per square kilometer. They collect data on 56 countries. State the individual, variable, population, sample, parameter, and statistic:_____________.

Answer 1

Answer:

Individual:  A single country.

Variable:   The mean density of people per square kilometer of all countries.

Population:  Set of all countries.

Sample:  Set of the 56 countries on which data is collected.

Parameter: The mean density of people per square kilometer calculated from the population.

Statistic:  The mean density of people per square kilometer calculated from the sample.

Explanation:

Individual: Individuals are the objects described by a set of data.

Variable: Variables are characteristics of individuals.

Population: Population is all individuals of interest.

Sample: Sample is a subset of the population.

Parameter: Parameter is a characteristic of a population.

Statistics: Statistic is a characteristic of a sample.