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Suggested answer to exercise: Alcohol consumption and sex, 3

Question 3: What does ‘The 95% confidence interval is 0.4 to 6.0 units/week’ mean
and what conclusion could we draw from it?

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Suggested answer

We are using the respondents as a sample of a larger population
and estimating the difference in alcohol consumption between men and women
in that larger population.

A confidence interval is a range of values which we estimate will include the difference
in the population.
A 95% confidence interval is chosen so that 95% of such samples would
include the population value.

We can conclude that we estimate that, in the population which this sample represents,
men report that they consume an average of between 0.4 and 6.0 more
units of alcohol per week than do women.

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Last updated: 31 October, 2006.

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