CEVAP:

The sign test gets its name from the negative and positive signs of the mathematical difference of the observations’ measurements. It is used for the hypothesis test about the population median, M. Inferences about the population median are important when the population has highly skewed distribution. In skewed distributions, the population median is more centrally located than the population mean. Therefore, population median is accepted as better estimator for the measure of location if the population is skewed. The sign test is a non-parametric alternative test for one sample t test, paired sample t test, and a research in which quantitative measurements is impossible but in which it is possible to rank the measurements with respect to each other.