If your population is normally distributed, which of the following statements re

Question

If your population is normally distributed, which of the following statements regarding confidence intervals of population means is always false?                                          
                                          
A.   When is known, we use the critical value, z.                                      
B.   When n >30, we use the critical value, z.                                      
C.   When n < 30, we use the critical value, t.                                      
D.   None of A-C are always false.                                        

Explanation / Answer

option d is right

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