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A Random Sample of Size N Has Been Selected from a Normally

Question 33

Multiple Choice

A random sample of size n has been selected from a normally distributed population. In hypothesis testing for the population mean, when should the t test be used instead of the z test?


A) when n < 30 andis unknown
B) when n > 30 andis unknown
C) when n < 30 andis known
D) both a and c

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