If the standard deviation is known, the z distribution values may not be used to determine interval estimates for the population mean when
A) n

Question

If the standard deviation  is known, the z distribution values may not be used to determine interval estimates for the population mean when
A) n < 30. 
B) the distribution is not normal. 
C) the distribution is skewed. 
D) n is big. 
E) n is small (<30) and the distribution is not normal.

Quizplus · Accepted Answer

The Answer of If the standard deviation  is known, the z distribution values may not be used to determine interval estimates for the population mean when
A) n < 30. 
B) the distribution is not normal. 
C) the distribution is skewed. 
D) n is big. 
E) n is small (<30) and the distribution is not normal.

If the Standard Deviation Is Known, the Z Distribution