Once you have obtained your data, you calculate the probability of obtaining this particular data, assuming that the null hypothesis is true. If the probability is too low (5% and 1% being typical ...

You are now ready to perform statistical analysis of your results, but first, you have to choose a critical value at which to reject your null hypothesis. You opt for a critical value probability ...

We can design studies to have particulat levels of power. We typically go for 80 or 90% power which mean 80% or 90% of the time, our study will correctly reject the null hypothesis. Sample size ...