1a) evaluate each argument for validity and soundness 2b) evaluate the arguments

Question

1a) evaluate each argument for validity and soundness

2b) evaluate the arguments for strength and cogency

Argument A Argument B If Abraham Lincoln was mortally stabbed in the back, then Abraham Lincoln was assassinated. Abraham Lincoln was not stabbed in the back. Therefore, Abraham Lincoln was not assassinated Since Alaska is not a part of the contiguous United States, it follows that Alaska shares a border with another state. Argument A is invalid and Argument B is and all true premises. Therefore does not have all true premises. Therefore, Argument A is unsound Argument B is Argument C Argument D Since the moon takes 50 days to orbit the earth, it follows that the moon must make at least one complete orbit around the earth in any two-month period Since 4 is an even number, it follows that 4 is divisible by 2. Argument C is and Argument D is and all true premises. Therefore, all true premises. Therefore Argument C is Argument D is

Explanation / Answer

1(a)Argument A is invalid and does not have all true premises. Therefore argument A is unsound.

Argument B is valid and have all true premises. Therefore argument B is sound.

Argument C is invalid and does not have all true premises. Therefore argument C is unsound.

Argument D is valid and have all true premises. Therefore argument D is sound.

2(b) Argument A is strong and does not have all true premises. Therefore argument A is uncogent.

Argument B is strong and does not have all true premises. Therefore argument B is uncogent.

Argument C is weak and does not have all true premises. Therefore argument C is uncogent.

Argument D is strong and does not have all true premises. Therefore argument D is uncogent

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