Bonus

Bonus

Have you finished early? Are you ready for an extra challenge?

This bonus section is extra hard. You will be asked to find sections of a Venn diagram that correspond to cells of a two-way table.

Read through the examples below then start the challenge!

One of the cells in the two-way table below is highlighted.

b

not b

total

a

not a

total

Once the table is filled in, this cell would tell us the number of items that have attribute 'a' but not attribute 'b'.

Where would this number appear in a Venn diagram? In other words, what section corresponds to 'a and not b'?

Venn diagram with two overlapping circles 'a' and 'b'.

It would be the part of the ‘a’ circle that does not overlap with the ‘b’ circle:

Venn diagram with two overlapping circles 'a' and 'b'. That part of circle 'a' which does not overlap with 'b' is green.

So the green section of the Venn diagram above corresponds to the highlighted cell in the table.

One of the cells in the two-way table below is highlighted.

b

not b

total

a

not a

total

Once the table is filled in, this cell would tell us the total number of items that do not have attribute 'b'.

Where would this number appear in the Venn diagram? In other words, what sections correspond to 'not b'?

Venn diagram with two overlapping circles 'a' and 'b'.

It would be the sections not in the ‘b’ circle.

Venn diagram with two overlapping circles 'a' and 'b'. The part of circle 'a' which does not overlap with 'b' is green and the section outside the circles is purple.

So the coloured sections of the Venn diagram above correspond to the highlighted cell in the table.