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# Do now! - PowerPoint PPT Presentation

Do now!. Last class we looked at inductive reasoning and generalisations. Can you remember the generalisations we discussed?. This man was possibly a God. Who was he?. Generalisations. French people are rude. Water boils at 100 °C. Most graffiti artists are under 25 years old.

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Presentation Transcript

Last class we looked at inductive reasoning and generalisations

Can you remember the generalisations we discussed?

This man was possibly a God. Who was he?

• French people are rude.

• Water boils at 100 °C.

• Most graffiti artists are under 25 years old.

• All generalisations are dangerous.

• When spelling in English “i before e except after c”.

• In Spanish, if a words ends in “o” it is masculine.

• Pit Bull dogs are dangerous.

• Norwegians are good at skiing.

• IB1 students are lazy.

• Metals expand when heated.

• There have been no AIDS cases amongst OIS students. OIS students must be free from AIDS.

• Afro-Caribbean people are good at sports.

• Boys are better at physics than girls.

• No-one succeeds without hard work.

What makes a good generalisation?

What makes a good generalisation?

You’ve got 5 minutes in your groups to think of “Five rules for making good generalisations”.

When you’ve agreed your five rules can you write them in your books?

What makes a good generalisation?

Let’s have a look at what the book says!

• Number

You should look at a good number of examples. If you see one dog swimming, this is not enough to decide that “all dogs can swim”

• Variety

You should look at a variety of circumstances. In the example of dogs swimming, looking at different breeds of dog.

• Exceptions

You should actively look for counter examples. Look for dogs that can’t swim!

• Coherence

You should look for more evidence to support surprising claims! If somebody suggests that all dogs have superpowers you may demand greater proof!

• Subject area

Generalisations may be more reliable in some subject areas (e.g. science) than in others (e.g. economics or other social sciences).

Do the “good” generalisations pass these tests?

What is wrong exactly with the generalisations that you thought were “bad”?

Can you now think of two “good” generalisations and two “bad” generalisations of your own. Write them in your books.