Which of the Following Statements About Indexes Is Incorrect

question 99

Multiple Choice

Which of the following statements about indexes is incorrect?

• A) An index is a database object that stores a frequently referenced value and the row id (ROWID) of the record containing that value.
• B) An index is only beneficial if a large percentage of a table is expected to be returned in query results.
• C) An index is used to speed up the process of searching for specific data.
• D) An index is updated automatically every time a DML operation is performed on the underlying table, which can slow down execution of the DML operation.

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Definitions:

Cronbach's Alpha

A measure of internal consistency that assesses how closely related a set of items are as a group, often used in survey research.

Internal Consistency

A measure of the reliability of a psychological test that assesses the extent to which different test items that propose to measure the same general construct produce similar results.

Cohen's Kappa

Cohen's Kappa is a statistical measure used to assess the reliability of inter-rater agreement for qualitative (categorical) items, correcting for the chance of agreement.

Item-total Correlation

The relationship between individual item scores and the overall score across all items in a test or questionnaire.