ConfidenceIntervallen
ConfidenceIntervallen are ranges of values derived from data that are used to estimate a population parameter with a specified level of confidence. In the frequentist framework, the interval is constructed so that, in repeated sampling, a fixed proportion of such intervals would contain the true parameter. The confidence level is typically 90%, 95%, or 99%.
To construct a confidence interval for a mean, one combines a sample statistic with its standard error.
Interpretation should be careful: a 95% confidence interval does not guarantee that the true parameter lies