A researcher wishes to study the effect of a new drug on blood pressure.  Answer and explain all questions

• Would you recommend using a z-test, a t-test, or an ANOVA for the analysis?  Explain your answer.
• What would your choice of test depend on?  For the test you select, explain your design and your comparison groups. 
• Would the hypothesis be directional or non-directional? 
• Would the test be one-tailed or two-tailed? 
• What would be the null and what would be the alternative hypothesis?