論理的思考2 部分的に正しい、全体として正しい

Generalizing about groups or properties can be problematic

健全な論理を使うことは、上級英語コミュニケーションに不可欠で、会議や、プレゼンテーションや会話などで、明快な解答をするのに役立ちます。また、英語のスピーキングテストの「論理」の部分でより高得点を獲得する事が可能になります。

Introduction

We'll look at how people can confuse specific information with general information, and we will discuss ways to accurately attribute information.

Warm Up

A man reasoned that since we can't see atoms, and you are made of atoms, you must be invisible.

We can agree that he is incorrect, but why is he incorrect?

Language

Let's talk about generalizing. When something is true for the whole, it may or may not be true for one part, and vice versa. For example:

Japanese people eat rice, and Junko is Japanese, so Junko definitely eats rice.

Do you think this is fair?

To point out a fallacy, You can start with these kind of phrases:

  • I don't think it's safe to say...
  • Actually I don't think...
  • I'm not sure I agree that...

We can, however, draw tentative conclusions. Imagine Junko is coming to your house for dinner, and you are thinking about making a rice dish. Would you ask Junko if she eats rice, or would you assume that she does? To discuss generalizations, we can use these phrases:

  • In general...
  • From my understanding/ experience...
  • As far as I know...
  • I think we can agree that...
  • ...most...
  • ...nearly all...

Discuss properties of groups in general with your instructor. What can you say about people who live in your area?

Practice

Try to refute and clarify these arguments. Is it true in part, completely true, or completely false?

  1. Cows are black and white. My cup is black and white. Therefore, my cup is a cow.
  2. Fuel costs have been decreasing, so it's safe to say that the price of airplane tickets will decrease in the foreseeable future.
  3. Marc Jacobs clothing is expensive, and that person's shirt says "Marc by Marc Jacobs" so the person must have paid a lot for their shirt.