Data and quality of data

Question 1

what is meant by encoded

Answer 1

simplifying the wat data is represented. e.g. M for Male

Question 2

benefits of encoding data

Answer 2

less space used, faster to enter data, fewer errors made when entering code, validation of data easier,

Question 3

what is meant by speed of access

Answer 3

time taken for a computer to find an item of data

Question 4

advantages of storing data using ICT

Answer 4

stored more securely, can be encrypted, can be accessed quickly, back ups can be created in other places.

Question 5

disadvantages of storing data using ICT

Answer 5

equipment can be expensive, specialist staff may be needed, viruses or hackers may damage data

Question 6

difference between data validation and data verifaication

Answer 6

data validation: used to ensure data entered is sensible

Data verification: used to ensure data has been entered correctly

Question 7

methods of verification

Answer 7

visual check( comparing source data and transcribed data by eye), 
double keying (entered by two people error given if there are differences)
parity check

Question 8

difference between transcribed and transmitted data

Answer 8

transcribed is copied from one medium to another, transmitted is sent from one computer medium to another

Question 9

what is a batch total

Answer 9

number calculated at the start of the transmission of a batch of data. it is done again at the end. newly calculated total compared with the first, difference means error

Question 10

what is a hash total

Answer 10

a batch total that has no meaning . e.g. the sum of phone numbers