Exercise: Diabetes and high blood pressure in the 2005 M.Sc. questionnaire

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)
    asthma         cancer
    diabetes     heart disease
    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
No Yes
No 172 20 192
Yes 7 3 10
Total 179 23 202


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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