3) Two of the statements below are false. Which are they? The median may exist in some cases for a sample of qualitative data. n The definition of the sample variance is S (X; - x)2. n If Yi = a + Xi, then Sy = a + Sy. The value expected from a constant is the constant itself. The expected value of the sum of two random variables is equal to the sum of the population means of the two random variables. The population mean of a normal distribution is also its population median and population mode. Zp = - Z1-p with 0