SOPHIA will be down Wednesday, December 7, 2016 at 4:30 AM (CST) for a little housecleaning. We are sorry if this causes you any trouble. The outage should last less than 5 minutes.

+
Random & Probability Sampling
Common Core: 7.SP.1

Random & Probability Sampling

Author: Isaiah Steinke
Description:

This lesson explains what random sampling is and why it's used.

(more)
See More

Try Our College Algebra Course. For FREE.

Sophia’s self-paced online courses are a great way to save time and money as you earn credits eligible for transfer to over 2,000 colleges and universities.*

Begin Free Trial
No credit card required

25 Sophia partners guarantee credit transfer.

221 Institutions have accepted or given pre-approval for credit transfer.

* The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 20 of Sophia’s online courses. More than 2,000 colleges and universities consider ACE CREDIT recommendations in determining the applicability to their course and degree programs.

Tutorial

Notes: Random & Probability Sampling

Overview

(0:00 – 0:29) Introduction; What is a random sample?

(0:30 – 1:19) Random vs. haphazard selection

(1:20 – 1:52) Why do we use random selection?

(1:53 – 2:38) Are random samples always representative?

(2:39 – 2:54) Recap


TERMS TO KNOW
  • Random Sample

    A sample that has been selected in a manner where every member of the population has some predetermined chance of being selected for the sample

  • Random Selection

    The method of obtaining a random sample

  • Probability Sampling Plan

    The way to collect a random sample that guarantees a certain likelihood for each member of the population to be selected