Usalduspiiridega

Usalduspiiridega refers to the concept of confidence intervals in statistics. A confidence interval provides a range of values, derived from sample data, that is likely to contain the true value of an unknown population parameter. It is expressed as a lower bound and an upper bound.

The width of a confidence interval reflects the uncertainty associated with the estimate. A wider interval indicates greater uncertainty, while a narrower interval suggests more precision. The confidence level, often expressed as a percentage (e.g., 95%), represents the probability that if the sampling process were repeated many times, the resulting confidence intervals would contain the true population parameter.

Confidence intervals are crucial for making inferences about populations based on sample data. They are used in various fields, including scientific research, market analysis, and political polling, to quantify the reliability of estimates. For example, a poll might report that a candidate has 52% support with a 95% confidence interval of 49% to 55%. This means that while the sample shows 52% support, the true support in the population is likely between 49% and 55%, with 95% confidence.