What is the z-score of sample X, if $n = 9, mu= 56, SD =30, and E[X] =32$ ?

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Answer 1 · 2016-12-21T07:48:25

The answer is $=2.4$

The z-score for a sample mean is

$z=(barx-mu)/(sigma/sqrt9)$

$barx= E[X]=32$

$mu=56$

$sigma=30$

$n=9$

Therefore,

$z=(32-56)/(30/sqrt9)=-24/10=-2.4$

What is the z-score of sample X, if n = 9, mu= 56, SD =30, and E[X] =32n = 9, mu= 56, SD =30, and E[X] =32?