What is a confidence interval (CI)?
Confidence intervals (CIs) are used to estimate the range within which a population parameter (e.g., a mean or proportion) is likely to fall, based on sample data. The interval provides a measure of uncertainty or precision around the sample estimate. The key purposes are: Estimate Population Parameters: CIs give a range for the true value of the parameter. Account for Sampling Variability: They reflect how much the estimate might vary from sample to sample. Provide More Information than Point Estimates:…