State the factors that affect power and what factors we have to specify to do a sample size calculation. Some notes on the behaviour of sample size calculations and power for unequal group sizes This ...

Sample size calculations are used to work out how big our study needs to be to give it a good chance of detecting the difference we think exists, if in fact that is the truth. They are also used if we ...

When you have the average production of three machines, it is easy to calculate the average or mean production. You just add up the three means and divide by three. But what if I want the average ...