|Late Deadline||not applicable|
All questions on the quizzes in this course are out of 3 points. When assessing these quizzes, score answers as follows:
- 3 is reserved for excellent responses that that fully explain the answer to the question, show a true understanding of the question being asked, and don’t contain any errors. As a general guideline, we expect no more than 25-30% of answers are likely to receive a 3 on any particular question.
- 2 is awarded for a good response that’s getting at the right idea, but might not explain it fully or might have a few minor errors. 2, indeed, is what the course expects most students are likely to earn. As a general guideline, we expect approximately 50-60% of answers are likely to receive a 2 on any particular question.
- 1 is awarded for an inadequate response that misses the mark, is wholly incorrect, or otherwise fails to answer what the question is asking.
- 0 is given to answers that are exceedingly brief, or blank, and as such are effectively non-responses.
The above rubric should be applied for all questions on the quiz.
If you give a score lower than full credit, please include a brief comment in the “Provide comments specific to this submission” section of the form. You can also re-use comments in the “Apply Previously Used Comments” to save time so that you don’t find yourself typing the same thing over and over!
- No. Sentence 1 can be true while Sentence 2 is false in a world where neither Hermione nor Harry are in the library.
- Yes. If we know that Harry is in the library, then Sentence 1 is true regardless of whether Hermione is in the library or not. Therefore, in every world where Sentence 2 is true, Sentence 1 is also true.
- Yes. Sentence 3 a logical contradiction — there are no worlds where it holds true. Therefore, by the definition of entailment, anything can be entailed.
- Yes. This is an application of logical resolution, where we eliminate the complementary literals “Harry is in the library” and “Harry is not in the library.”
- (A ∨ B) ∧ ¬(A ∧ B) or, equivalently (A ∧ ¬ B) ∨ (¬ A ∧ B)
- The sentence would hold true when A and B are both the same value: either both false or both true.
- R → (C ∧ ¬ S)
- (¬ R ∨ C) ∧ (¬ R ∨ ¬ S)
- Hermione is a student enrolled in Charms.
- There is a student who is enrolled in Potions.
- Everyone who is a student is not enrolled in Charms.
- There is a course that both Harry and Ron are both enrolled in.