Statistics:Health Science 92Chapter 1

By;Samantha Barcellos

Statistics is the science of collecting, describing, and interpreting data.

Data can be collected and put on multiple kinds of graphs. Common graphs used are the bar

graph, circle graph, and line graph.

The Bar Graph

Data: 100 randomly-selected tenth-grade students and their letter grade on a test

The Circle Graph

Data: 100 randomly-selected people and their preferred movie genre

The Line Graph

Data: sales revenue of a business, per month

Dol

lars

(in

mill

ions

)

(Per month)

A population is a collection, or set, of individuals, objects, or events whose properties are to be analyzed

A qualitative variable is a variable of the data that describes or categorizes and element of a population

A quantitative, or numerical, variable is a variable that quantifies an element of a population

A population

Possible people to be surveyed

A quantitative variable A quantity variable consists of numbers or a set of values, such as

surveying a group of 15 blondes, 15 brunettes, and 15 redheads

A qualitative variable

A qualitative variable can involve only surveying a group of blonde-haired people or a group of brunette-haired people or a group of red-haired people

Population can also be broken down into a sample, finite population, and infinite population.

Population

SampleFinite Population

Infinite

Population

SampleA sample is a subset of a population

Finite Population

A finite population is a population whose membership can or could be physically listed

Example: a small group of people

Infinite Population

An infinite population is a population whose membership is unlimited.Example: the population of everyone on Earth

These are the simple facts of Statistics.