confidence interval

noun

Definition of confidence interval 

: a group of continuous or discrete adjacent values that is used to estimate a statistical parameter (such as a mean or variance) and that tends to include the true value of the parameter a predetermined proportion of the time if the process of finding the group of values is repeated a number of times

Examples of confidence interval in a Sentence

Recent Examples on the Web

That range is 793 to 8,498, with a 95 percent confidence interval. Washington Post, "The Health 202: Medicaid expansion in red states is likely to come via voters in November," 4 June 2018 Analysis of the survey data showed a mortality rate of 14.3 deaths per 1,000 people from the period of Sept. 20 to Dec. 31, 2017, yielding a total number of excess deaths at 4,645 people with a confidence interval of 95 percent. Daniel Cusick, Scientific American, "Hurricane Maria Contributed to Nearly 5,000 Deaths, Researchers Say," 30 May 2018 The survey was conducted from March 4 through 18 and has a 3.4 percent margin of error at a 95 percent confidence interval. Joshua Stewart, sandiegouniontribune.com, "New poll puts Republican John Cox of Rancho Santa Fe in second place in governor's race," 22 Mar. 2018 HQuack creator Jake Mor told Ars the site started as a simple program on his computer, Googling questions and giving confidence intervals to the possible answers based on the number of results. Kyle Orland, Ars Technica, "A wave of cheating AI robots is threatening to ruin HQ Trivia [Updated]," 12 Feb. 2018 The survey, which was conducted Oct. 9 through Oct. 12, has a 4.4 percentage point margin of error and 95 percent confidence interval. Andrea Zelinski, Houston Chronicle, "Democratic pollster suggests tight race for AG," 14 Dec. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'confidence interval.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of confidence interval

1934, in the meaning defined above

Keep scrolling for more

Learn More about confidence interval

Share confidence interval

Statistics for confidence interval

Look-up Popularity

Time Traveler for confidence interval

The first known use of confidence interval was in 1934

See more words from the same year

More from Merriam-Webster on confidence interval

Britannica.com: Encyclopedia article about confidence interval

Comments on confidence interval

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

WORD OF THE DAY

to reject or criticize sharply

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Roman Mythology Quiz

  • the-triumph-of-venus-by-alessandro-magnasco
  • Boreal comes from the name of the ancient Greek god of which wind?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Bee Cubed

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!