Complete the sentence below. The standard deviation of the sampling distribution of x overbar​, denoted sigma Subscript x overbar​, is called the​ _____ _____ of the​ _____. The standard deviation of the sampling distribution of x overbar​, denoted sigma Subscript x overbar​, is called the ▼ standard population sample ▼ mean error deviation distribution variance of the ▼ mean. sample. error. distribution.