![]() A lower bound defines a value that the population mean is likely to be greater than. For example, a 95% confidence level indicates that if you take 100 random samples from the population, you could expect approximately 95 of the samples to produce intervals that contain the population mean.Īn upper bound defines a value that the population mean is likely to be less than. The percentage of these confidence intervals or bounds that contain the mean is the confidence level of the interval. But, if you repeated your sample many times, a certain percentage of the resulting confidence intervals or bounds would contain the unknown population mean. Because samples are random, two samples from a population are unlikely to yield identical confidence intervals. ![]() The confidence interval provides a range of likely values for the population mean.
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