Problem 3. Walkers(10 marks)

A medical researcher is interested in determining if there is a relationship between blood pressure and regular walk for adults over 50. A random sample of 240 adults over 50 is selected and the results are given below.Test whether the blood pressure is independent of regular walk. (Use = 0.05.)

Blood Pressure	Low	Moderate	High
Walkers	35	64	27
Non-walkers	21	65	28

Figure 1. Blood pressure data.

1. Identify the claim and state the null and alternative hypothesis. [2 marks]
2. Determine the critical value and the rejection region. [2 marks]
3. Calculate the test statistic. [4 marks]
4. Decide whether to reject or fail to reject the null hypothesis. Interpret the decision in the context of the problem. [2 marks]