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
Dolla
rs (i
n m
illio
ns)
(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.