Data processing and information：练习题

Which of the following is a specific example of indirect data as defined in the syllabus?

A system calculates a value based on the data in a block and transmits it alongside the block. Upon receipt, the value is recalculated and compared to detect errors. This is an example of a:

A data entry system for a hospital uses both a hash total and a check digit. Which of the following scenarios correctly distinguishes the primary purpose of these two methods?

Which of the following is considered a source of direct data?

In asymmetric encryption, if User A wants to send a secure message to User B, which key should be used to encrypt the message?

Describe why the age of information is a critical factor in determining its quality.

Distinguish between data validation and data verification, explaining why a system might require both.

State one major disadvantage of using direct data compared to indirect data.

A university is conducting a study on student living costs.
(a)<\/b> Identify two different sources of direct data<\/b> they might use.
(b)<\/b> Identify two different sources of indirect data<\/b> they could collect for this study.<\/p>

Organizations must decide whether to use direct or indirect data for their business intelligence.
(a)<\/b> Describe two advantages<\/b> of collecting direct data specifically for a given purpose.
(b)<\/b> Describe two disadvantages<\/b> of using direct data compared to indirect data.<\/p>