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Suggested answer to exercise: Evaluation of a nurse-run asthma school, 2

Question 2: In 'Smoking habits', what is meant by ‘n.s.’?
What can we conclude from this?

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Suggested answer

This means `not significant'.
The probability of getting a difference as big as this if the null hypothesis were true
is greater than 0.05.
We can conclude that we have failed to show that there is a difference in the population,
i.e. that smoking decreases following Asthma School.
We cannot conclude that there is no difference.
There may be a difference which the sample is not large enough to detect.

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Last updated: 20 October, 2006.

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