Data and quality of data

Question 0

What does encoded do?

Answer 0

Simplifies the way data is represented

Question 1

Can data be encoded

Answer 1

Yes

Question 2

Give an Example of Encoded

Answer 2

M- Male and F- Female

Question 3

What are the Benefits of encoded Data

Answer 3

• Less computer memory used
• It is faster to enter the data
• Fewer errors made when data is entered
• Validation of the data is easier

Question 4

What is it call for the time taken for a computer to find an item of data?

Answer 4

Speed of Access

Question 5

Where does the memory come from?

Answer 5

Random Access Memory (RAM)

Question 6

What is the access time measure in?

Answer 6

Nanoseconds

Question 7

The access time for hard drives and other secondary data is…

Answer 7

Milliseconds

Question 8

What does Speed of Access mean?

Answer 8

The time taken from the time the request for data is made to the time that the data is received

Question 9

What are the advantages for using ICT for storing data?

Answer 9

• Data can be edited easily
• Data can be encrypted so that it is secure
• Back-up copies can be creates easily
• Data can be transmitted very quickly to another device

Question 10

What are the Disadvantages if using ICT for storing data?

Answer 10

• Cost of equipment can be high

- Viruses or hackers may damage the data

Question 11

Data is only useful if…

Answer 11

Valid

Sensible

Up-to-date

Question 12

What is data Validation used for?

Answer 12

Make sure that the data being entered is sensible

Question 13

What is Data Verification used for?

Answer 13

Ensure that the data being entered has been entered correctly

Question 14

Data can be…

Answer 14

Copied from one medium to another (Transcribed)

Sent from one computer medium to another (Transmitted)

Question 15

Verification checks are needed to…

Answer 15

make sure the data received is the same as the data that was sent

Question 16

How are transcription errors caused?

Answer 16

Corruption of data by electrical interference

Question 17

Give 3 transcription errors

Answer 17

• Omission - Leaving out data
• Transposition - e.g. typing 1324 instead of 1234
• Spelling mistakes

Question 18

Give 3 Methods of Verification

Answer 18

• Visual Check
• Double Keying
• Parity Check

Question 19

What is Parity Check?

Answer 19

As a series of binary numbers.

Even Parity - Total number of 1’s are Even

Odd Parity - Total number of 1’s are Odd

Question 20

Name four types of validation check?

Answer 20

Range Checks

Presence Checks

Format Checks

Check Digits

Question 21

What are the two new Validation Checks?

Answer 21

Batch Total - Check the total at start then checks at end if different this means an error in transmission

Hash Total - Is a batch total that has no meaning.