Do you understand what a “95% confidence interval” means?

For each of the following 20 questions, provide a range that you are 95% confident includes the correct answer. Answers to the questions and how to interpret your results can be found at the bottom of the page, and if you want more information on this exercise and why it is important, please watch the video below.

Questions

Questions can also be found in PDF format

  1. Distance from earth to nearest star (excluding sun), in light-years

    95% confidence interval: [ _________ , _________ ]

  2. GDP of Mongolia, in USD

    95% confidence interval: [ _________ , _________ ]

  3. Height of tallest man in recorded history, in inches

    95% confidence interval: [ _________ , _________ ]

  4. Depth of deepest part of Pacific Ocean, in meters

    95% confidence interval: [ _________ , _________ ]

  5. Average distance from earth to moon, in miles

    95% confidence interval: [ _________ , _________ ]

  6. Population of Russia in 2019

    95% confidence interval: [ _________ , _________ ]

  7. Maximum number of passengers carried on Emirates A380 aircraft (two-class layout)

    95% confidence interval: [ _________ , _________ ]

  8. Number of passengers who died on the Titanic

    95% confidence interval: [ _________ , _________ ]

  9. Market capitalization of Apple on the day Steve Jobs died, in USD

    95% confidence interval: [ _________ , _________ ]

  10. Fastest lap time in an F1 car around the Monaco circuit, in min:sec

    95% confidence interval: [ _________ , _________ ]

  11. Number of regular season goals scored by Wayne Gretzky in his NHL career

    95% confidence interval: [ _________ , _________ ]

  12. NASAs budget for the year 2019, in USD

    95% confidence interval: [ _________ , _________ ]

  13. Number of Big Macs sold globally in a year (on average) by McDonalds

    95% confidence interval: [ _________ , _________ ]

  14. Number of students from China attending U.S. colleges in the 2018-2019 academic year

    95% confidence interval: [ _________ , _________ ]

  15. Total number of passengers flying domestically on U.S. airlines in 2019

    95% confidence interval: [ _________ , _________ ]

  16. Amount of coal produced by U.S. mines in 2019, in pounds

    95% confidence interval: [ _________ , _________ ]

  17. Breeds eligible to compete at the 144th Westminster Kennel Dog Show

    95% confidence interval: [ _________ , _________ ]

  18. Number of total worldwide searches processed by Google each day

    95% confidence interval: [ _________ , _________ ]

  19. Full weight (including planes, ammunition, people) of a Nimitz-class aircraft carrier, in pounds

    95% confidence interval: [ _________ , _________ ]

  20. Number of times that the name “Jesus” appears in the King James bible

    95% confidence interval: [ _________ , _________ ]

Answers and interpretation

You can click the PDF below to see the answers to the questions as well as learn more on how you can interpret your results.

Download answers and learn how to interpret your results (PDF)   Download full questions and answers (PDF)

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