Table 2

Egbert writes down some things that he thinks are important for the calculation

What is the null hypothesis?That Jabba Juice will be no more effective than bendrofluazide in treating new presentations of hypertension.
What level do we want to avoid a type I error at? (pα)We set this to 0.05
What level do we want to avoid a type II error at? (pβ)We set this to 0.8
What is the “clinically important difference” we want to detect?For this study we want to detect a minimum 10 mm Hg difference between treatments.
What type of data and analysis are likely?Continuous normally distributed data. To be analysed using a t test
What is the standard deviation of blood pressure in this group of patients?From other studies we know that the standard deviation is 20 mm Hg.