Verifying and Validating Data

Question 1

What is the process of checking that data has not changed during transfer or input to a computer called?

Answer 1

Verifying Data

The aim is to ensure that data is copied or entered exactly as intended.

Question 2

What is one method of verifying data that requires data to be entered twice?

Answer 2

Double Entry

This method compares the two entries for discrepancies.

Question 3

What method of data verification uses parity bits?

Answer 3

Parity Check

It checks whether data has been altered during transmission.

Question 4

What does a checksum do in data verification?

Answer 4

Calculates a value based on the data to detect errors after transmission or storage.

This value can be used to confirm the integrity of the data.

Question 5

In the context of transferring a file, what does verification ensure?

Answer 5

That the file has reached its destination successfully and that its contents are unchanged.

Question 6

What is the purpose of validating data?

Answer 6

To check that data meets certain predefined criteria before it is processed or used.

Question 7

What type of validation check ensures a value falls within a specified range?

Answer 7

Range Check

For example, age should be between 0 and 120.

Question 8

What does a presence check verify?

Answer 8

That important data fields are not left empty.

Question 9

What does a length check ensure?

Answer 9

That data contains the correct number of characters

For example, a phone number has 10 digits.

Question 10

What type of validation check verifies that data is in a specified format?

Answer 10

Format Check

For example, a date in the format DD/MM/YYYY.

Question 11

What does a character check ensure?

Answer 11

That data contains only permissible characters

For example, an email address should include ‘@’.

Question 12

What does a type check confirm about data?

Answer 12

That data is of the correct data type

For example, numerical fields should not contain letters.