Valid or invalid? 1) B if A. A. Therefore, B. 2) Some X are Y. Therefore, not al

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) B if A. A. Therefore, B. is a invalid statment. Because B if A is a meaning less.

2) Some X are Y. Therefore, not all X are Y is a valid statment because some x means few x are equal to y.

1) 95% of random surveys are accurate. This is a random survey. Therefore, it is 95% probable that this survey is accurate c. Inductive, unreasonable.

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