DEFINITION of 'Population'
The entire pool from which a statistical sample is drawn. The information obtained from the sample allows statisticians to develop hypotheses about the larger population. Researchers gather information from a sample because of the difficulty of studying the entire population. In statistical equations, population is usually denoted with a capital 'N', while the sample is usually denoted with a lowercase 'n'.
BREAKING DOWN 'Population'
For example, let's say a denim apparel manufacturer wants to check the quality of the stitching on its blue jeans before shipping them off to retail stores. It is not cost effective to examine every single pair of blue jeans the manufacturer produces (the population). Instead, the manufacturer looks at just 50 pairs (a sample) to draw a conclusion about whether all 500 pairs of jeans produced (the population) are likely to have been stitched correctly.

Uniform Distribution
In statistics, a type of probability distribution in which all ... 
Symmetrical Distribution
A situation in which the values of variables occur at regular ... 
Negative Correlation
A relationship between two variables in which one variable increases ... 
Positive Correlation
A relationship between two variables in which both variables ... 
Simple Random Sample
A subset of a statistical population in which each member of ... 
Probability Distribution
A statistical function that describes all the possible values ...

Retirement
The Cities Where the UltraRich Retire in Arizona
Discover the aspects that make Arizona an attractive destination for retirement, and learn about the cities where retirees are choosing to settle. 
Home & Auto
The Cities Where the UltraRich Retire in California
Discover why many rich individuals are choosing to retire in California, and some of the cities that are popular as retirement destinations. 
Retirement
The Cities Where the UltraRich Retire in New York
Discover why wealthy and active adults retire in New York, the cities they favor and key information about each city that makes it attractive to retirees. 
Home & Auto
5 Cities the UltraRich Are Moving to
Learn the top five cities worldwide that are attracting the most highnetworth individuals, and discover factors that make a city appealing to the ultrarich. 
Economics
A Look at How China Controls Its Population
Discover the many tactics China utilizes to control its population, and learn how the population control movement is driven by economic concerns. 
Mutual Funds & ETFs
5 Ways To Measure Mutual Fund Risk
These statistical measurements highlight how to mitigate risk and increase rewards. 
Fundamental Analysis
Scenario Analysis Provides Glimpse Of Portfolio Potential
This statistical method estimates how far a stock might fall in a worstcase scenario. 
Active Trading
Introduction To Stationary And NonStationary Processes
What to know about stationary and nonstationary processes before you try to model or forecast. 
Investing
What a Family Tradition Taught Me About Investing
We share some lessons from friends and family on saving money and planning for retirement. 
Investing
Where the Price is Right for Dividends
There are two broad schools of thought for equity income investing: The first pays the highest dividend yields and the second focuses on healthy yields.

What assumptions are made when conducting a ttest?
The common assumptions made when doing a ttest include those regarding the scale of measurement, random sampling, normality ... Read Full Answer >> 
How might a company use demographics to assess the size of a potential market?
Demographics can be used to help a company determine key characteristics of the potential population to which it company ... Read Full Answer >> 
What can demographics tell us about present and future consumption trends and economic ...
Demographics gives insight into future population growth, which can reveal present and future consumption trends and economic ... Read Full Answer >> 
How does stratified random sampling influence government policy decisions?
Governments use various analytical techniques to examine the potential costs and benefits of policy options. One of those ... Read Full Answer >> 
What are some of the uses of the coefficient of variation (COV)?
In statistics, the coefficient of variation (COV) is a simple measure of relative event dispersion. It is equal to the ratio ... Read Full Answer >> 
What is the difference between systematic sampling and cluster sampling?
Systematic sampling and cluster sampling differ in how they pull sample points from the population included in the sample. ... Read Full Answer >> 
How can I use systematic sampling in finance?
Systematic sampling is useful in finance for situations where it is impractical to review the entire population for certain ... Read Full Answer >> 
What are the best selection methods for creating a simple random sample?
The best selection methods for selecting a simple random sample are the lottery method, using a random number table or having ... Read Full Answer >> 
What are the disadvantages of using a simple random sample to approximate a larger ...
Simple random sampling statistically measures a subset of individuals selected from a larger group or population to approximate ... Read Full Answer >> 
What is the difference between a simple random sample and a stratified random sample?
Simple random samples and stratified random samples differ in how the sample is drawn from the overall population of data. ... Read Full Answer >> 
What are the advantages and disadvantages of using systematic sampling?
As a statistical sampling method, systematic sampling is simpler and more straightforward than random sampling. It can also ... Read Full Answer >> 
What are the advantages and disadvantages of stratified random sampling?
Researchers use stratified random sampling to obtain a sample population that best represents the entire population being ... Read Full Answer >> 
What are some examples of stratified random sampling?
Simple random sampling is a sample of individuals that exist in a population; the individuals are randomly selected from ... Read Full Answer >>