Section 5
Errors in Sampling
Book
Version 1
By Boundless
By Boundless
Boundless Statistics
Statistics
by Boundless
4 concepts
![Thumbnail](../../../../../../figures.boundless-cdn.com/18040/raw/standard-deviation-diagram.jpg)
Expected Value and Standard Error
Expected value and standard error can provide useful information about the data recorded in an experiment.
![Thumbnail](../../../../../../figures.boundless-cdn.com/18059/raw/standard-deviation-diagram.jpg)
Using the Normal Curve
The normal curve is used to find the probability that a value falls within a certain standard deviation away from the mean.
The Correction Factor
The expected value is a weighted average of all possible values in a data set.
![Thumbnail](../../../../../../figures.boundless-cdn.com/17994/square/voter-poll.jpeg)
A Closer Look at the Gallup Poll
The Gallup Poll is an opinion poll that uses probability samples to try to accurately represent the attitudes and beliefs of a population.