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. |