The alternative hypothesis is also also known: 

A research group is investigating the effect of two experimental treatment regimes. Patients were assigned to one of three groups: control, treatment A, or treatment B. After treatment, the mean values for the three groups were compared. The appropriate statistical test for comparing these means is:

Which of the following is not an assumption for a two-way anova?

To investigate the effect of fruit on cholesterol, 40 participants were randomised into two treatment groups (20 in each). Both groups were given the same information about healthy diet and activity, BUT only one group was given 75 grams of dried apple as well to consume daily. The cholesterol level for every participant was measured (in mmol/L) before the study, and six months later, and the % change was calculated. 

Choose the most appropriate statistical method to decide if eating apple has any effect on the change in cholesterol: