specialize - devote oneself to a special area of work; She specializes in honey bees; This baker specializes in French bread specialise work - exert oneself by doing mental or physical work for a purpose or out of necessity; I will work hard to improve my grades; she worked hard for better living conditions for the poor
Critical Value in Statistics. In statistics, the critical value corresponds to a given significance level. This cutoff value determines the boundary between the two samples, on the basis of which it is determined, whether null hypothesis should be accepted or rejected.
Par value is the face or stated value of a share of stock. In the case of common stocks, par value usually does not correspond to the market value of a stock, and a stated par value is of little significance.