Hi Jiradett,

Remembered "data" = plural and "datum" = singular. See link below:

http://www.gingersoftware.com/english-online/spelling-book/confusing-words/data-datum

Data

Definition:

a collection of facts from which conclusions may be drawn (plural of datum)

Examples:

statistical data

Datum

Definition:

an item of factual information derived from measurement or research (singular of data)

Examples:

the first task is the assignment of an address to each datum

You can also refer to some computer science books like by CS French or text books from British Computer Society.

Yes agreed remembered the term "data" used interchangeably as plural or singular in some writings.  Suggesting you cite / get ready some renown books / articles in case you are questioned by reviewer / exam panel.  Wishing you all the best.

Regards,

Fung