Which type of check examines the accuracy of numerical data entries?

The check digit is used to verify the accuracy of numerical data entries by adding an additional number produced from the digits of the sequence. This method is particularly common in systems like barcodes and identification numbers, where the check digit can help identify errors such as typos or incorrect sequences in data entry. When the data is processed, the system can calculate the expected check digit based on the other numbers in the entry and compare it with the provided check digit. If the two match, it indicates a higher probability that the data is accurate.

In the context of the other options, a length check ensures that the data entered meets a specified number of characters or digits but does not assess numerical accuracy directly. A presence check simply verifies whether required data fields are filled but does not evaluate their correctness. A format check checks if the data matches a specified format (for example, a date or email structure) but again does not specifically address the accuracy or validity of the numerical values themselves.