DefinitionConfidence intervals are a type of statistical interval, were developed to estimate the range in which a population parameter, such as the mean or proportion, lies with a particular confidence level llikelihood is likely to fall. They are prepared using a set of data samples and give a range of likely values for a population parameter and a level of confidence. These confidence intervals are then are employed in inferential statistics to make inferences about population parameters and to give an indication of their uncertainty. Illustration:A 95% confidence interval for the population mean µ from the sample of mean xˉ and standard deviation s would be given by xˉ±1.96nswhere n is the sample size.
