Deductive Arguments

The following reading materials attached: Chapter 5, Rules of Inference, and Some Valid Arguments. Also, you will find the below assignment attached as well.

Assignment:

1. In the following passages, there is a valid argument. But a premise or the conclusion is not stated and some statements in the passage may be missing implied phrases or words. Your task: Write out the entire argument, starting with numbered premises, and ending with the conclusion. You’ll have to fill in what’s missing. Underline everything that you added. Remember that this chapter (#5) concerns deductive arguments, not inductive. Your goal: show me that you mastered this material.
a. That’s an advanced physics class; all those people are brains.
b. Nobody can fall off a bike on their head and not be injured, so he’s injured.
c. It seems like everyone who goes to lots of movies loves Julia Roberts. Becky does not love Julia Roberts.
d. Granita is in a good mood. It’s her birthday.
e. Anyone who missed class more than three times failed the course. Cecile missed class four times.
f. Anyone who missed class more than three times failed the course. Cecile barely passed the course.
g. All people who missed class more than three times are people who failed. Cecile is a person who did not fail the course.

2. Find the logically correct conclusion for each of the following arguments.

a. The drought will continue if we don’t get a storm. If we do get a storm, the managers of the ski areas will be happy.

b. If there’s no early storm, the drought will continue. And if the drought continues, there will be a great danger of fire next year.

c. If a flyer is posted on one of the bulletin boards, then it was approved by the Associated Students. I found one flyer posted on a bulletin board somewhere in a remote men’s room on the 4th floor of Curtis.

d. All Drexel University students are like dragons. Anyone who is like a dragon must be an idiot, which Julia, by all accounts, is not.
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