W4 ALS461_Basic Logical Concepts (Exercise 3.3 1-10)

1. Because x = 3 and y = 5, then x + y = 8.

• Inductive

• Deductive

1. According to the New York Public Library Desk Reference, the pop-up toaster was invented by Charles Strite in 1927. The New York Public Library Desk Reference is a highly reliable reference work. Therefore, it’s reasonable to believe that Charles Strite did invent the pop-up toaster in 1927.

• Inductive

• Deductive

1. Seventy-three percent of Ft. Gibson residents enjoy fishing. Lonnie is a Ft. Gibson resident. So, it’s likely that Lonnie enjoys fishing.

• Inductive

• Deductive

1. Either Elmo will win the election or Schlomo will win the election. But Elmo won’t win the election. Therefore, Schlomo will win the election.

• Inductive

• Deductive

1. The burglar is tall and thin. Duncan is short and fat. Obviously, therefore, Duncan isn’t the burglar.

• Inductive

• Deductive

1. There are no visible signs of forced entry. It seems certain, therefore, that the burglar had a key.

• Inductive

• Deductive

The sign says it is 7 miles to Lake Lily. Therefore, it is approximately

7. 7 miles to Lake Lily.

• Inductive

• Deductive

7. Joan is an extrovert. It follows that she is outgoing.

• Inductive

• Deductive

7. All inductive generalizations are inductive. Some inductive generalizations are unreliable. Therefore, some inductive arguments are unreliable.

• Inductive

• Deductive

If it rains, the game will be postponed until next Saturday. According to the National Weather Service, there’s a 90 percent chance of rain. Therefore, probably the game will be postponed until next Saturday.

• Inductive

• Deductive