Which of the Following Is True About the Database Development

question 31

Multiple Choice

Which of the following is true about the database development process?

• A)The database structure cannot be changed during the data modeling stage.
• B)Changing a relationship from 1:N to N:M is simply a matter of changing the notations.
• C)User review of the data model is avoided as it is not helpful in data modeling.
• D)A database is a model of how the developers view their business world.

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Definitions:

Z-score

A statistical measurement that describes a value's relationship to the mean of a group of values, measured in terms of standard deviations from the mean.

T-score

is a type of standardized score that indicates how many standard deviations an individual's score is from the mean of a norm group.

Percentile

A percentile is a statistical measure indicating the value below which a given percentage of observations in a group of observations falls.

Mode

A measure of central tendency that represents the score with the greatest frequency in a distribution.