ZTväärtus
ZTväärtus (Z-value) is a standardized measure that indicates how many standard deviations a value X is from the mean of a distribution, typically the standard normal distribution N(0,1). It provides a way to compare observations from different distributions on a common scale.
Calculation can be expressed in several forms. For a single observation X drawn from a population with
ZTväärtus follows the standard normal distribution N(0,1). This allows converting observations into p-values and comparing results
Common uses include hypothesis testing with Z-tests, constructing confidence intervals, and identifying critical values at chosen
Limitations include the assumption of normality or a large-sample approximation. When these conditions are not met,