A Data Mart Usually Can Be Constructed More Rapidly and at Lower

question 78

Multiple Choice

A data mart usually can be constructed more rapidly and at lower cost than a data warehouse because

• A) a data mart typically focuses on a single subject area or line of business.
• B) all the information is historical.
• C) a data mart uses a Web interface.
• D) all of the information belongs to a single company.

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Definitions:

Pooled Sample Data

Combining data from multiple samples to create a larger sample, often used in statistical analysis to increase the reliability of results.

Normal Approximation

A statistical technique used to estimate the distribution of a large set of data using the normal distribution.

Standardized Test Statistic

A computed value that measures the difference between an observed statistic and its hypothesized value, scaled by the standard error.

P-value

The probability of obtaining test results at least as extreme as the ones observed during the test, assuming that the null hypothesis is true.