What does the notation z_α indicate? The expression z_α denotes the z score with an area of alpha between -z_α and zₐlpha to its left. to its right.
a) The z score with an area of alpha to its left.
b) The z score with an area of alpha to its right.
c) The z score with an area of alpha between -z_α and z_α to its left.
d) The z score with an area of α between -z_α and z_α to its right.