Question 1

Data warehouses cannot purchase external data from outside resources.

Accepted Answer

Data warehouses can purchase external data from outside resources to enhance their data sets and improve their analysis.

Question 2

A terabyte is larger than a petabyte in terms of computer storage.

Accepted Answer

A petabyte is larger than a terabyte in terms of computer storage. One petabyte is equivalent to 1000 terabytes.

Question 3

Expert systems encapsulate the knowledge of human experts in the form of If/Then rules.

Accepted Answer

This statement is true. Expert systems are designed to mimic the decision-making ability of human experts by using a set of logical rules commonly known as If/Then rules. These rules help the system identify and solve specific problems by applying the knowledge of subject matter experts in a given domain.

Question 4

Raw operational data is seldom suitable for more sophisticated reporting or data mining.

Accepted Answer

Raw operational data needs to be processed and transformed before it can be used for reporting or data mining. This transformation involves cleansing, filtering, aggregating, and organizing the data in a way that makes it easier to analyze and generate insights. Without this preprocessing step, the data is often too granular and messy to be useful for more advanced analytics.

Question 5

Generally,it is better to have data that is too coarse a granularity than data that is too fine.

Accepted Answer

It is generally better to have data that is too fine a granularity as it allows for more detailed analysis and insights. Coarse data may lead to oversimplification and inaccurate conclusions.

Question 6

Data from social networking and user-generated content applications are likely be more accurate than purchased data.

Accepted Answer

Data from social networking and user-generated content applications are likely to be more accurate as they are provided by the users themselves, rather than purchased from third-party sources that may contain errors or outdated information. Users have a personal interest in ensuring the accuracy of their own information, and social networks often have mechanisms to ensure that information is kept up-to-date and verified by other users.

Question 7

Data that are critical for successful operations must be complete and accurate,however data that are only marginally necessary do not need to be.

Accepted Answer

It is important to ensure that critical data is complete and accurate as it can have a significant impact on operations. However, data that are only marginally necessary may not require the same level of scrutiny and can be less comprehensive or precise.

Question 8

One kilobyte consists of 1,000 bytes.

Accepted Answer

A kilobyte is a unit of digital information equal to 1,024 bytes.

Question 9

Data-mining systems integrate data from multiple sources,processing it by sorting,grouping,and averaging,and delivering reports on the results.

Accepted Answer

Data-mining systems analyze data to discover patterns and relationships, rather than just processing and reporting data like traditional data processing systems.

Question 10

Data marts are usually larger than data warehouses.

Accepted Answer

Data marts are typically smaller subsets of a larger data warehouse, designed to meet the needs of specific departments or business units within an organization. Therefore, data warehouses are usually larger than data marts.

Question 11

A typical low-resolution photograph is equal to 1 terabyte.

Accepted Answer

A typical low-resolution photograph usually takes up around 1-2 megabytes of storage space, which is far less than 1 terabyte.

Question 12

Data marts are data collections that address a particular business problem or opportunity.

Accepted Answer

Data marts are designed to address a particular business problem or opportunity by providing focused and relevant data to a specific group of users. They are smaller than a data warehouse and are designed to be more easily and quickly accessible to end-users.

Question 13

The curse of dimensionality states that the more attributes there are,the more difficult it is to build a model that fits the sample data but the more relevant it is as a predictor.

Accepted Answer

The curse of dimensionality refers to the phenomenon where the addition of more attributes makes it harder to build a model that generalizes well, as it increases the risk of overfitting and computational complexity, not necessarily making it more relevant as a predictor.

Question 14

Data warehouses extract and clean data from operational systems.

Accepted Answer

Data warehouses are designed to collect, clean, and integrate data from various operational systems, in order to provide a consolidated view for business analysis and reporting.

Question 15

Data granularity refers to the degree of detail of the data.

Accepted Answer

Data granularity refers to the level of detail or specificity of the data. It can refer to a broad view of data or a more detailed view with specific data points. The greater the granularity, the more detailed the data.

Question 16

Market-basket analysis is a data mining system.

Accepted Answer

Market-basket analysis is a data mining system used to discover patterns and relationships in transactional data, particularly in retail and e-commerce industries.

Question 17

An organization's data warehouse DBMS cannot be different from the organization's operational DBMS.

Accepted Answer

An organization's data warehouse DBMS can be different from the organization's operational DBMS. The data warehouse is designed to support complex analytics and reporting, while the operational DBMS is optimized for transaction processing. It is common for organizations to use different DBMSs for each function.

Question 18

Data warehouses and data marts are expensive to create,staff,and operate.

Accepted Answer

Data warehouses and data marts require significant investment in terms of resources, infrastructure, and personnel, making them expensive to create, staff, and operate.

Question 19

Reporting systems compute correlations of items on past orders in order to determine items that were frequently purchased together.

Accepted Answer

The answer of Reporting systems compute correlations of items on...

Question 20

Knowledge-management systems follow If/Then rules.

Accepted Answer

Knowledge-management systems do not inherently follow If/Then rules; they are designed to capture, distribute, and effectively use knowledge, which can involve various methods beyond rule-based systems.

Quiz 9: Business Intelligence and Information Systems for Decision Making