Valid or invalid? 1) B if A. A. Therefore, B. 2) Some X are Y. Therefore, not al
ID: 3354976 • Letter: V
Question
Valid or invalid?
1) B if A. A. Therefore, B.
2) Some X are Y. Therefore, not all X are Y
Multiple choice
1) 95% of random surveys are accurate. This is a random survey. Therefore, it is 95% probable that this survey is accurate. a. Deductive, valid b. Inductive, reasonable c. Inductive, unreasonable
2) If was an amateur theft. Matt's fingerprints were the only ones on the safe. Amateur thieves nearly always leave fingerprints. Therefore, Matt was the thief who broke into the safe. a. Deductive, valid b. Inductive, reasonable c. Inductive, unreasonable
3) Both presidential candidates have attended college. Most people who have attended college have graduated from high school. Therefore, both presidential candidates have graduated from high school. a. Deductive, valid b. Inductive, reasonable c. Inductive, unreasonable
4) No runner over 40 years old has ever won the Olympics 100 meter dash. Therefore, no runner over 50 years old will win this year's Olympics 100 meter dash. a. Deductive, valid b. Inductive, reasonable c. Inductive, unreasonable
Explanation / Answer
1) VALID. This is given clause when we say B if A. So A automatically implies B.
2) VALID. There will be some X which does not correspond to Y and some X which corresponds to Y.
1) a. Deductive and Valid. This is deduced from the fact that 95% of the random surveys are accurate.
2) c. Inductive Unreasonable. This helps in concluding that matt could be the theif but it is unreasonable because matt may or may not be the thief.
3) b. Inductive and reasonable. The statements are inductive and have a logical reason for the conclusion.
4) a.Deductive, valid . Here one statement implies another and are based on a sound basis of logic and fact.
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