Hypothesis 1

Hypothesis one is usually your main hypothesis in which it could be something like this:

'The older you are the faster you are at puzzles'

So first I would stratify sample my data, the groups would be according to what my min and max value is. This can be found out by using the formula =MIN(Range) and =MAX(Range) into excel. So, for example I have an age range of 10 - 18 I would create groups or strata's like this: 10<x<=12, 12<x<=14...... 16<x<=18. Then I would do random sampling as described on the sampling page. Click here

Then