People with diabetes are are increased risk of several health problems, including high blood pressure. In the 2005 M.Sc. questionnaire, respondents were asked
|Have you ever been diagnosed as having:|
|(please tick all that apply)|
|high blood pressure||other long-term disease|
|(please write in)||_________________________|
In this exercise, we look at the relationship between reported diabetes and high blood pressure.
This is a crosstabulation:
|Diabetes||High blood pressure||Total|
1. What kinds of variables are diabetes and high blood pressure?
Check suggested answer 1.
2. Which cell of the table would have the smallest expected frequency and, roughly, what would this be?
Check suggested answer 2.
3. What statistical method should be used to test the null hypothesis that diabetes and high blood pressure are unrelated in this population, and why?
Check suggested answer 3.
4. The test gives P = 0.09. What can we conclude about high blood pressure and diabetes?
Check suggested answer 4.
We shall return to these data next week.
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Last updated: 10 November, 2006.
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