Suppose You Have Created a Data Model for an Airline

question 97

Multiple Choice

Suppose you have created a data model for an airline based on a variety of forms,reports,user interviews,data sources,etc.Your client comes forward with a new desired report that includes passenger weights and a relationship between passengers and employees,neither of which is in your E-R diagram.You should ________.

• A)create a new,separate E-R diagram with just the new information
• B)add the relationship and the weight attribute to the existing data model
• C)add the relationship but not the weight attribute
• D)add the weight attribute but not the relationship

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Definitions:

Internal Validity

The extent to which a study can prove that a cause-and-effect relationship exists between the tested variables, excluding the influence of external factors.

Nonmonotonic Relationship

A relationship between two variables where the direction of the effect changes over the range of the variable, meaning it can increase then decrease, or vice-versa.

Independent Variables

The factors that are manipulated or varied by researchers in an experiment to determine their effect on the dependent variable.

Dependent Variable

In experimental research, the variable that is being tested and measured, expected to change as a result of manipulations to the independent variable.