47729
Descripción
ICT Unit 1: Topic 1
- Data and Quality of Data
- Data, Information and
Knowledge
- Data- Raw facts and figures with no
meaning. Data can be numbers, text,
images or sound
- Information- Data that has been
processed by the computer.
- Data+Meaning+Context=Information
- Data+Meaning+Context=Information
- Knowledge- Information that has
had rules applied to it
- Data- Raw facts and figures with no
meaning. Data can be numbers, text,
images or sound
- GIGO
- Stands for Garbage in
Garbage Out
- It means if you input rubbish
data into the computer then you
will get rubbish data out
- Stands for Garbage in
Garbage Out
- Processing
- Performing calculations or arranging
the data into a meaningful order
- Performing calculations or arranging
the data into a meaningful order
- Transaction
- A piece of buisness
- E.g. an order, purchase,
or transfer of money
- E.g. an order, purchase,
or transfer of money
- A piece of buisness
- Data, Information and
Knowledge
- Encoding and Storing Data
- Encoding
- Assigning codes to the
data to reduce it's size
- E.g. S=Small, M=Medium,
L=Large
- E.g. LHR= London Heathrow,
MAN= Manchester
- Assigning codes to the
data to reduce it's size
- Advantages
- Takes up less
storage space
- Easily Transferable
- Easier to back-up
- Takes up less
storage space
- Disadvantages
- Easily stolen
- Training is needed
- Security problems
- Easily stolen
- Encoding
- Data Validation
- Errors that can be made
- Transcription Error
- Error made when typing in
data using a document as
the source of data
- e.g. mishearing what a person
says over the phone and
entering it into the computer
- Error made when typing in
data using a document as
the source of data
- Transposition Error
- Error made when characters
are swapped around so they
are in the wronng order
- e.g. writing tumlbr
instead of tumblr
- Error made when characters
are swapped around so they
are in the wronng order
- Transcription Error
- Validation Checks
- Check Digit
- A decimal number or alphanumeric
character added to a number for the
purpose of detecting the sorts of
error humans normally make on data
entry
- e.g. Account numbers will have
check digits to check that the
numbers entered are correct
- A decimal number or alphanumeric
character added to a number for the
purpose of detecting the sorts of
error humans normally make on data
entry
- Range Check
- checks that data inputted
is within a certain range
- e.g. when signing up for facebook you
have to be 13 or older,so anyone with the
birth year below 2000 would not be
allowed to sign up
- checks that data inputted
is within a certain range
- Presence Check
- used to check that the
correct data is entered into
the correct fields
- e.g. entering a username
and password
- used to check that the
correct data is entered into
the correct fields
- Verification Checks are used to
restrict the data that a user can
enter to reduce errors
- Check Digit
- Errors that can be made
- Data Verification
- Pairty Check
- used to make sure that the
data sent is the same as the
data that is received when data
is transmitted from one
computer to another
- e.g sending an email
from one person to
another
- used to make sure that the
data sent is the same as the
data that is received when data
is transmitted from one
computer to another
- Data verification checks that
the data being entered into
the system perfectly matches
the source of data
- e.g. checking text/data in an email and
making sure when the other user receives it
there are no errors
- e.g. checking text/data in an email and
making sure when the other user receives it
there are no errors
- Pairty Check
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