The Confidence Level Calculator determines how confident you can be that a sample accurately represents the true population parameter within a specified margin of error. It uses the z-score, which measures how many standard deviations the sample mean is from the population mean, calculated through the relationship Z=EnσZ = \frac{E \sqrt{n}}{\sigma}Z=σEn​​. The resulting confidence level is then derived from this z-score to show the probability that the true mean falls within the given range. This calculator is helpful in statistics and research to assess the reliability and accuracy of data estimates.