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24 Cards in this Set
- Front
- Back
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what is data? |
data is raw unprocessed facts inputted in a computer system |
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examples of data |
facts of persons places and things |
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what is information ? |
data that has been processed or data that has been put into context |
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data vs information |
data has is raw facts ; info is processed data data has no context ; info has context data is plain number or image ; info has value added to data through analysis (comparison), computation (avg, counting and totals) organisations (sorting and rank) |
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what are the two different meanings of source of data? |
the first meaning is the things that has been measured and the other meaning is the person or organization that has provided the data from observation |
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data is generally recorded continually but not always recorded. what is an example of a big producer of data? |
nature. it produces wind speed, temperature and amount of rainfall |
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what is a source document? |
a document that contains original data for input into a information processing system |
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what are the different primary data type? |
audio, image, animation sequence, graphic objects, text and video |
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examples of the different primary types of data |
audio - video interview recorded graphic objects - illustrations and drawings image - picture of a drivers' licence text - data from questionnaires, video - youtube video and instagram video animation sequence - text 'flying' into a presentation |
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what are the different types of document used to collect, store and share data? |
document, turnaround document, human-readable and machine-readable |
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what is a document? |
this is a printed or written paper based item used to collect, store or share data |
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what is a a turnaround document? |
a printed document that has been outputted from a computer system to have extra information added then inputted or to become a input document |
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what is a human readable document? give examples |
a document that can be read by a human but isn't in a form that can be accepted as input by a machine. eg |
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what is a machine readable document? give examples |
a document that can be read drectly and understood by computer systems. eg barcodes, qr codes, disk drives, sensors |
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what is a hard copy? |
hard copy is output in printed form |
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what is a soft copy? |
electronic version of a document which can be opened and edited on a software program |
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what is data integrity and what does GIGO mean? |
the degree to which data is correct. garbage in garbage out
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what is the reliability of information? |
the degree to which the content of the information can be depended on to be accurate |
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what are the four characteristics of reliability? explain them |
authencity - if the information is true or false) lack of bias - information has been fairly judged not influenced by personal opinions) currency - information is not out of date relevance - info is connected to its use |
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what is data verification? |
the process by which an individual carries out a check to see if the information entered by another is correct. dv is a human process |
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what are the two common errors? |
typographical (a typing error like a missing letter) and transpositional error (the switching position of 2 adjacent characters 5460 = 5640) |
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two main methods of verification are? |
double entry (requires the data be entered twice by two different clerks then checking to see if it is identical)and proofreading(data entry clerk checking the source document against the data inputted by another clerk ). |
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what is data validation? |
the process of comparing data with a set of rules to find if the data is correct. data validation is an automatic process done by software |
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what are the types of data validation? explain them |
range check - the data value within the expected range data type check - the data matches the data type (colour=text, length=number) consistency check - does the data type relate to or contradict the other data? reasonableness check - ensures the data conforms to specific criteria (it is unreasonable for a person to become a driver w/o a drivers' licence) presence check - all fields mark 'required' must have something in them format check - does the data conform to the format? (date must be dd/mm/yyyy) length check - is the data of the correct length? (year must be 4 digits) |
