# Making and Testing Hypotheses - July 2008, Stage 4&5

## Problems

### Ishango Bone

##### Stage: 2, 3, 4 and 5 Short Challenge Level:

Can you decode the mysterious markings on this ancient bone tool?

### Snow and Cholera

##### Stage: 4 Challenge Level:

What information helped medical pioneers decide on the cause of a disease? Especially in a time before microscopes were as powerful as they are today ?

### Counting Fish

##### Stage: 4 Challenge Level:

I need a figure for the fish population in a lake, how does it help to catch and mark 40 fish ?

### Babylon Numbers

##### Stage: 3, 4 and 5 Challenge Level:

Can you make a hypothesis to explain these ancient numbers?

### Quads

##### Stage: 4 and 5 Challenge Level:

The circumcentres of four triangles are joined to form a quadrilateral. What do you notice about this quadrilateral as the dynamic image changes? Can you prove your conjecture?

### Reaction Timer Timer

##### Stage: 5 Challenge Level:

How can you time the reaction timer?

### Least of All

##### Stage: 5 Challenge Level:

A point moves on a line segment. A function depends on the position of the point. Where do you expect the point to be for a minimum of this function to occur.

### Spot the Difference

##### Stage: 5 Short Challenge Level:

If you plot these graphs they may look the same, but are they?

### Pattern Recognition

##### Stage: 5 Challenge Level:

When does a pattern start to exhibit structure? Can you crack the code used by the computer?