ENTRY 4: VU THI THUY

Entry 4: Vũ Thị Thủy

Argument structures and fallacies

ITEM 1

Amanda buys a lottery ticket from a different shop than usual. She gets 4 numbers and wins £50. She decides to go out of her way to buy her tickets from that shop again.
Source: http://www.ukskeptics.com/explanation.php?dir=articles/explanations&article=post_hoc.php
Content fallacy:
This is “post-hoc fallacy”:  because she claimed that a lottery ticket from different shop was luckier than the usual shop, so won 50 dollars

ITEM 2

“Ông A không phải là nhà hành chính học vì thế ông ta không phải là người nắm vững khoa học quản lý.”

Source: http://www.wattpad.com/701826-bai-tap-logic-hoc

-          The type of argument structures and fallacies: Invalidity of the argument (Denying the antecedent)

-          Analysis:

Nhà hành chính học là người nắm vững khoa học quản lý.

Ông A không phải là nhà hành chính học.

Ông A không phải là người nắm vững khoa học quản lý.

The structure:

If A, then B

Not A

Therefore not B

The inference is wrong. Because in this case, B still happens if there is not A. Therefore this argument is invalid.

 ITEM 3

 Source:http://www.thegioitimkiem.com/anh-quang-cao/639-hinh-anh-quang-cao-vui-va-y-nghia.html

 

Analysis:
Fallacy type:
Denying the antecedent
If A, then B
not  A,
 Therefore, not B
If you want to keep contact with someone, send them a letter
ð    If you do not want to keep contact with someone, don’t send them any letter
In fact, you have many other ways to contact with someone without a letter.