Problem: A general practitioner wants to conduct a simple investigation into the effectiveness of a relaxation technique for hypertensive patients. Patients diagnosed with high blood pressure are randomly allocated to two groups of equal size, one of which receives the relaxation therapy while the other receives advice and supporting leaflet on controlling blood pressure. After a month each person’s blood pressure is recorded.

1. What type of study is this?
2. What type of design is used?
3. What is the independent variable
4. What is the dependent variable?
5. State the null hypothesis (one-tailed)
6. State the null hypothesis (two-tailed)
7. What would be an appropriate level of significance for testing this hypothesis?
   
   
8. How might the results from this study be confounded and how could this be avoided?

1. What would be the appropriate parametric statistical test?
2. What are the assumptions about the data that are required for applying this test?
3. If the assumptions are not met, what would be the appropriate statistical test?
4. What steps would be involved in analysing the data?
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5. If a third condition, ‘no treatment’ was introduced and blood pressure was measured and compared for each of the three groups after one month, what would be the appropriate statistical test.
   1. if the assumptions for a parametric test are met?
   2. if the assumptions for a parametric test are not met?

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Solution: The downloadable solution consists of 4 pages, 599 words.
Deliverable: Word Document