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Uncertainty in Measurement: Reading Instruments02:46

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Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
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In engineering applications, the representation of the numerical value is critical. Presenting or reporting the answer is one of the essential parts of engineering practices. Numerical calculations are performed using handheld calculators or computers since numerically accurate answers are always preferred.
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Uncertainty in measurements can be avoided by reporting the results of a calculation with the correct number of significant figures. This can be determined by the following rules for rounding numbers:
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Uncertainty in Measurement: Significant Figures03:34

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All the digits in a measurement, including the uncertain last digit, are called significant figures or significant digits. Note that zero may be a measured value; for example, if a scale that shows weight to the nearest pound reads “140,” then the 1 (hundreds), 4 (tens), and 0 (ones) are all significant (measured) values.
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In any measurement, the precision of the measuring tool is an essential factor. An ordinary ruler, for example, can measure length to the closest millimeter; a caliper, on the other hand, can measure length to the nearest 0.01 mm. As a result, the caliper is a more precise measurement tool because it can measure extremely minute changes in length. The measurements will be more accurate if the measuring tool is more precise.
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A complete procedure for testing a claim about a population proportion is provided here.
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Related Experiment Video

Updated: Jun 26, 2025

An Experimental Analysis of Children's Ability to Provide a False Report about a Crime
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Correction: When eleven does not equal 11: Investigating exactness at a number's upper bound.

Ira Noveck, Martial Foegel, Kira Van Voorhees

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    Summary

    This study corrects a previously published article DOI. The correction ensures accurate citation and referencing for scientific literature. This is crucial for maintaining the integrity of research records.

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    Area of Science:

    • Bibliometrics
    • Scientific publishing
    • Scholarly communication

    Context:

    • Accurate citation is fundamental to scientific integrity.
    • Digital Object Identifiers (DOIs) are essential for locating research articles.
    • Correction notices are vital for maintaining the accuracy of the scientific record.

    Purpose:

    • To provide a correction notice for a specific article.
    • To ensure the correct DOI is associated with the publication.
    • To uphold standards in scholarly communication.

    Summary:

    • This entry serves as a correction to the article with DOI 10.1371/journal.pone.0266920.
    • The correction ensures the Digital Object Identifier (DOI) is accurately recorded.
    • This action rectifies a potential issue in the article's metadata.

    Impact:

    • Ensures researchers can reliably access and cite the corrected article.
    • Maintains the integrity and traceability of scientific literature.
    • Supports accurate bibliometric analysis and scholarly record-keeping.