STATISTICS FROM A TO Z<br />-- CONFUSING CONCEPTS CLARIFIED
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Statistics Tip of the Week: The Margin of Error is 1/2 the width of a 2-sided Confidence Interval

10/4/2017

1 Comment

 
In the July 18, 2017 Statistics Tip of the Week, we showed how a Confidence Interval is calculated. As illustrated in the concept flow diagram below,
  • the tester selects a value for Alpha, the Significance Level.
  • This, plus a Test Statistics Distribution, gives us 2 Critical Values for a 2-sided test.
  • We convert these values into units of the data, x, giving us 2 Confidence Limits which define a Confidence Interval.
Picture
​Based on this, we might summarize the results of the test by saying "With a 95% Level of Confidence, we estimate the Mean height to be 175 centimeters, with a Margin of Error of plus or minus 5 cm."
Picture
1 Comment
Brody Oconnor link
10/17/2023 05:01:14 pm

I enjoyed reeading this

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    Author

    Andrew A. (Andy) Jawlik is the author of the book, Statistics from A to Z -- Confusing Concepts Clarified, published by Wiley.

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  • Home
    • Why This Book Is Needed
    • Articles List, Additional Concepts
    • Examples: 1-Page Summaries
    • Examples: Concept Flow Diagram
    • Examples: Compare and Contrast Tables
    • Examples: Cartoons
    • Example: Which to Use When Article
  • Buy
  • Blog
  • Sample Articles
  • Videos
  • Author
  • Communicate
  • Files
  • Errata