when two variables have a positive and a negative distribution can two dependent variables with negative values have a normal distribution for x-y? can a nonnegative variable have a normal distribution xyy distribution can two dependent variables with negative value have a normal distribution for x-y? can two independent variables with no normal mean have a normal distribution? can two independent variables have a normal distribution can two dependent variables that are negative have a normal distribution for both variables can a two independent variable be a normal distribution? can two independent variables with negative value be normalized? can two dependent variables have a normal distribution? can a rv be nonnegative without a normal distribution? why does it need a half normal? why not are the dependent variables y and x positive? how to find the relationship between two variables in the distribution of x and y can half normals be used for normal distribution can two independent variables that have a normal distribution? how do the two dependent variables that take on only positive values have a regular distribution can two independent variables have a normal distribution can a two independent variables have a normal distribution can two independent variables that are negative have a normal distribution for x-y?