Data

Question 1

In ASCII, each character is represented with how many bits?

Answer 1

In ASCII, each character is represented with 7 bits

Question 2

What is data validation?

Answer 2

Data validation checks that data being passed into a program meets a set of requirements

Question 3

List the types of validation checks

Answer 3

range check
format check
length check
presence check
check digit

Question 4

What is data verification?

Answer 4

Data verification is used to ensure that the data entered is what the user intended to enter.

Question 5

List the verification methods

Answer 5

Proofreading
Double entry
Parity check
Checksum

Question 6

What kind of errors do check digit algorithms detect?

Answer 6

Check digit algorithms are designed to detect - human transcription errors, such as:
- letter/digit errors, e.g. I -> 1 or O -> 0
- single-digit errors, e.g. 1 -> 2
- transposition errors, such as 12 -> 21