Statistics

Question 7 (1 point) What do all non-parametric tests covered in class, except the Sign Test, have in common? They all involve converting the data to ranks. They all involve converting the data to plus and minus signs. They all involve means. They assume normality of the data. Question 8 (1 point) When are nonparametric statistics needed? When the population standard deviation is not known. When the sample is not obtained in a random fashion. When the parameters of the population are unknown. When a normal distribution cannot be assumed