Usaldusväärsusvahemikuni

Usaldusväärsusvahemikuni is an Estonian term that translates to "confidence interval" in English. It is a statistical concept used to estimate the range within which a population parameter is likely to lie, based on a sample of data. A confidence interval provides a measure of the uncertainty associated with an estimate.

The confidence level, typically expressed as a percentage (e.g., 95%), indicates the probability that the confidence interval contains the true population parameter. For instance, a 95% confidence interval means that if the same sampling procedure were repeated many times, 95% of the calculated intervals would capture the true population parameter.

Confidence intervals are constructed using sample data and a chosen confidence level. They consist of a lower bound and an upper bound, defining the range. The width of the interval is influenced by the sample size and the variability of the data. Larger sample sizes and smaller variability generally lead to narrower, more precise confidence intervals.

These intervals are widely used in various fields, including scientific research, market analysis, and opinion polling, to provide a more complete picture of the uncertainty surrounding estimates derived from sample data. They are a crucial tool for interpreting statistical results and making informed decisions.