z-test

noun
\ ˈzē-ˌtest How to pronounce z-test (audio) \

Definition of z-test

: any of several statistical tests that use a random variable having a z distribution to test hypotheses about the mean of a population based on a single sample or about the difference between the means of two populations based on a sample from each when the standard deviations of the populations are known or to test hypotheses about the proportion of successes in a single sample or the difference between the proportion of successes in two samples when the standard deviations are estimated from the sample data

First Known Use of z-test

1951, in the meaning defined above

Keep scrolling for more

Learn More about z-test

Time Traveler for z-test

Time Traveler

The first known use of z-test was in 1951

See more words from the same year

Statistics for z-test

Cite this Entry

“Z-test.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/z-test. Accessed 9 December 2019.

Comments on z-test

What made you want to look up z-test? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

contradictory or incongruous words

Get Word of the Day daily email!

Test Your Vocabulary

Semantic Drift Quiz

  • a twisty river
  • Which of the following was once a synonym for fun?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Add Diction

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!