Validation versus verification
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which check confirms that an entered age is a number between 0 and 120?
2. Which check confirms that the data typed in matches the original paper form?
3. A student enters 25 as their age, but their paper form says 15. Both values pass a range check. Which statement is true?
4. Proofreading entered data against the source document is an example of:
5. A program rejects an empty email field with an existence check. This is:
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1if age < 0 or age > 120: | Aif name == "": print("Name is required") | |
| 2if entered == source_copy: | BProofreading is verification: it compares the entered data with the source. It does not test whether a value is reasonable or in range. | |
| 3Validation checks that data is reasonable and complete, for example that a required field is not empty | Cif email1 != email2: print("Entries do not match") | |
| 4Verification by double entry: the user types the data twice and the two entries must match | DValidation: a range check that tests whether the entered age is reasonable | |
| 5if mark >= 0 and mark <= 100: print("Verified: matches the source") | EVerification: checks that the entered data matches the original source data | |
| 6Proofreading confirms a value is within an allowed range. | FA range check is validation, not verification. It checks the mark is reasonable but does not compare it to the source data. |
C
Definitions
validation vs verification
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
if 0 <= age __ 120:
2.
email = input("Email: ")
again = input("Re-enter email: ")
if email __ again:
3.
if ___(name) > 0:
4.
if age < 0 __ age > 120:
print("Invalid age")
5.
source = "Ava Nguyen"
typed = input("Retype name: ")
print(______ == typed)
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
def is_valid_age(age)
B
return 0 <= age <= 120
C
print(is_valid_age(25))
Question 2
A
pw1 = input('Password: ')
B
pw2 = input('Re-enter: ')
C
if pw1 = pw2:
D
print('Verified')
Question 3
A
mark = int(input('Mark: '))
B
if mark >= 0 or mark <= 100:
C
print('Valid')
D
else:
E
print('Invalid')
Question 4
A
name = input('Name: ')
B
while name == '':
C
name == input('Name: ')
D
print('Hello', name)
Question 5
A
source = 'S1042'
B
typed = inpt('ID: ')
C
if typed == source:
D
print('Matches source')
Answer Key
Validation versus verification
Section A: Quick Questions
Q1
A — Validation
Q2
A — Verification
Q3
B — Validation passes but verification would catch the error
Q4
A — Verification
Q5
B — Validation
Section B: Match the Pairs
Q1
if age < 0 or age > 120: → Validation: a range check that tests whether the entered age is reasonable
Q2
if entered == source_copy: → Verification: checks that the entered data matches the original source data
Q3
Validation checks that data is reasonable and complete, for example that a required field is not empty → if name == "":
print("Name is required")
Q4
Verification by double entry: the user types the data twice and the two entries must match → if email1 != email2:
print("Entries do not match")
Q5
if mark >= 0 and mark <= 100:
print("Verified: matches the source") → A range check is validation, not verification. It checks the mark is reasonable but does not compare it to the source data.
Q6
Proofreading confirms a value is within an allowed range. → Proofreading is verification: it compares the entered data with the source. It does not test whether a value is reasonable or in range.
Section C: Definitions
Q1
validation vs verification — Validation checks entered data is reasonable and complete. Verification checks it matches the source data, for example by proofreading.Section D: Fill in the Blanks
Q1
if 0 <= age <= 120:Q2
email = input("Email: ")
again = input("Re-enter email: ")
if email == again:Q3
if len(name) > 0:Q4
if age < 0 or age > 120:
print("Invalid age")Q5
source = "Ava Nguyen"
typed = input("Retype name: ")
print(source == typed)Section E: Spot the Error
Q1
A — A validation function is a normal function, so the def line must end with a colon: def is_valid_age(age):
Q2
C — Double entry verification compares the two entries. = assigns a value and is invalid in an if condition. Use == to compare.
Q3
B — This range check must use and, because a mark has to be at least 0 and at most 100. With or, every number passes, so invalid data is never rejected.
Q4
C — This existence check must store the new input. == only compares, so name never changes and the loop never ends. It should be name = input('Name: ').
Q5
B — The function name is misspelled. It must be input(), otherwise Python raises a NameError and the typed data can't be verified against the source.