Confidence Intervals

A confidence interval is a measure of uncertainty around an estimate from a survey, indicating the range of values within which the true (population) measure being estimated lies with a given degree of confidence. In other words the confidence interval provides the range within which (say) 95 per cent of estimates could be expected to lie if the survey was repeated. The 95 per cent confidence interval for 2011 Census population estimate of Scotland is 5,295,000 plus or minus 23,000 people.