Suggested answer to exercise: Evaluation of a nurse-run asthma school, 1

Question 1: In 'Knowledge of the disease and the asthma medication', what is meant by p<0.001? What can we conclude from this?

Suggested answer

This is the probability of getting a difference as big as that observed in the sample if the null hypothesis, that there is no difference in the population from which the sample comes, were true. As the probability is small and less than the 0.05 conventional cut-off, the difference is significant. There is good evidence that the knowledge of asthma is increased between starting the Asthma School and 12 months later.

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Last updated: 20 October, 2006.

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