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

Random & Probability Sampling

Author: Isaiah Steinke

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

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

26 Sophia partners guarantee credit transfer.

226 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 21 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.


Notes: Random & Probability Sampling


(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
  • Probability Sampling Plan

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

  • 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