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Suggested answer to exercise: Estimation, standard error and confidence intervals, 2

Question 2: What is meant by 95% CI 6.1 to 8.8%?

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Suggested answer

This is the 95% confidence interval.
It is a range of values which we estimate will contain the population
percentage of preterm births.
This is in the sense that if a large number of samples were taken
from the same population, then 95% of the calculated confidence intervals would
contain the population percentage.
Here we can deduce that the population value is very likely to lie between 6.1% and 8.8%.

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Last updated: 27 July, 2009.

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