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IT AS Notes




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IT AS Notes


Chapter 1 - Data, Information, knowledge and processing
Data, Information and knowledge

Data ­ raw facts and figures before they have been processed.

Information ­ Data + [structure] + [context] + Meaning

Structure ­ how the data is presented? Are the numbers actually numbers or should they…

Page 5

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IT AS Notes

Graphics Multilingual ­ do not Can be confusing if you do not
need language to know the symbols ­ does everyone
understand an image. know the road signs?
E.g. male or female Some symbols do not mean the
Can match what you
same thing in different countries…

Page 6

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IT AS Notes

12.00

Used to hold numbers where precision is important:

Measurements in a house / building ­ 2.7m wide
Prices of goods - £1.75
Height of people ­ 1.82m

Integer ­ contains whole numbers with no decimal places.
45
125
1250

Used where accuracy may not be vital…

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IT AS Notes

Direct (primary) ­ collected form an original source. Often easiest to think of it as data that has
been physically collected by you.

Indirect (secondary) ­ has two interpretations:

Data that has been used for a purpose different to that for which it was collected. For
example,…

Page 8

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IT AS Notes


Requires a computer with CD-ROM drive Doesn't need computer ­ can access from
any device with internet access ­ mobile /
tablet
Data can't be updated very quickly Data can be updated quickly
Can be scratched / broken or lost / stolen Internet access can be down.…

Page 9

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IT AS Notes

Taking the original data and storing it in a different a different representation. E.g. shorthand or
putting it into code.

Advantages Disadvantages
Less memory requirement ­ storing less Precision of data coarsened ­ for example,
information therefore less memory is required light blue encoding as blue
Security…

Page 10

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IT AS Notes

Check digit ­ used to calculate and verify the barcode. The check digit is the last digit.

Verification

If you have collected some information on paper, at some point it will need to be entered into a
computer.

Paper-based copy is known as the source document.

The…

Comments

margaret Reeves

Looks brilliant thanks

raza1242

mad geezar

_Rukhsana

Helpful!

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