Review Test Submission: Quiz 8 University of British Columbia PHIL 120 (Questions and Answers)
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Course
PHIL 120
Institution
PHIL 120
Review Test Submission: Quiz 4 – 2015WC-PHIL120-...
H Learning Modules Module 4: Elementary Logic Review Test Submission: Quiz 4
Review Test Submission: Quiz 4
User Shu Kai Yan
Course 2015WCPHIL12099CIntroduction to Critical Thinking99C Jan 2016
Test Quiz 4
Started 2/8/16 10:30 PM
...
review test submission quiz 4 university of british columbia phil 120 questions and answers
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4/28/2016 Review Test Submission: Quiz 4 – 2015WC-PHIL120-...
Shu Kai Yan 27
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H Learning Modules Module 4: Elementary Logic Review Test Submission: Quiz 4
Review Test Submission: Quiz 4
User Shu Kai Yan
Course 2015WCPHIL12099CIntroduction to Critical Thinking99C Jan 2016
Test Quiz 4
Started 2/8/16 10:30 PM
Submitted 2/8/16 10:40 PM
Due Date 2/8/16 11:59 PM
Status Completed
Attempt 47.9997 out of 54 points
Score
Time 10 minutes out of 1 hour and 30 minutes
Elapsed
Instructions General Instructions:
Quiz 4 consists of 9 questions. You are given 1.5 hours (90 minutes) to complete the quiz.
Question 1:
Determine the truth value of the given propositions relating to the definition of a valid / invalid
argument.
Questions 23:
Compute the truth value of the given compound propositions given the information about the truth
values of their constituent parts (atomic propositions).
Question 4:
Using any of the truth table methods, determine whether the given arguments are valid or invalid.
Questions 59:
Translate the following statement into symbolic form, using the abbreviations provided, and match it
with one of the propositions in the list.
IMPORTANT:
Please note that the quiz must be finished and submitted before the corresponding deadline as in the
schedule, not just started once the deadline is reached, the system will automatically stop the quiz
and you will no longer be allowed to continue with the quiz (so you might lose your points for the quiz).
Also, when you are done, make sure you press the Submit button unless you do so, the quiz may not
automatically be submitted to the system (and you risk losing all the points for this quiz)!
If, while taking the Quiz, you experience any technical problems which prevent you from completing
the Quiz, you must immediately report your issue to the ITpeople responsible for the technical
issues (not the instructor!) by following the "DL Help Desk" link on the main course menu. The Help
Desk people monitor and record the current situation and they will then send their report to me, the
instructor, with all the relevant information. If not reported to the DL Help Desk, I, the instructor, will not
be able to verify any issues with the Quiz, and, as such, will not be able to change your grade or give
you any other attempt to finish the quiz.
Determine whether the following propositions are True [T] or False [F].
Correct Selected
Question
Match Match
“No invalid arguments have true conclusions.” 2. False 2. False
“No valid arguments have false conclusions.” 2. False 2. False
“An argument has all the premises true and the conclusion false only if it is 1. True 1. True
invalid.”
“An argument has all the premises and the conclusion true, if it is invalid.” 2. False 2. False
“Valid arguments may preserve falsity.” 1. True 1. True
All Answer Choices
1. True
2. False
Response
Feedback: 1. "No invalid arguments have true conclusions." – [F]
Feedback:
(Counter) Example:
Prem. 1: Today is Monday. [May be T, may be F, depending on whether or not
today is Monday. Here it doesn’t matter.]
Concl.: [Therefore, it logically follows from the premise 1 that] Jupiter is the
biggest planet in the Solar system. – T
The conclusion here is true but this is so not due to the truth of the premise; there
is no relation of logical entailment between the information in the premise and the
information in the conclusion, thus invalid argument. Informally, to check whether
there is logical entailment, try inserting the phrase "Therefore, it logically follows
from the premise(s) that" in front of the conclusion and see whether the resulting
argument sounds good.
2. "No valid arguments have false conclusions." – [F]
Feedback:
(Counter) Example:
Prem. 1: (All) people have no less than 15 legs. – F
Prem. 2: George Bush is human. – T
Concl.: [Therefore, it logically follows from the premise 1 that] George Bush has no
less than 15 legs. – F
Though the conclusion (as well as one of the premises) is false, clearly, there is a
relation of logical entailment between the premises and the conclusion, thus invalid
argument. Indeed, the "Therefore, it logically follows from the premises that" test
makes perfect sense; the logic cannot be blamed for the falsity of the conclusion; it
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