Which of the following statements are correct when deciding whether to use the z normal distribution or the t distribution? ( )
A.
Use the z normal distribution in a test of population proportion when nπ and n(1 - π) are greater than or equal to 5.
B.
Use the z normal distribution in a test of population mean when the population is normal and the population standard deviation is known.
C.
Use the t distribution in a test of population mean when the population is normal and the population standard deviation is not known.
D.
All of the above statements are correct.