What is the z-score of sample X, if #n = 54, mu= 12, St. Dev. =30, and mu_X =11#?
1 Answer
Mar 1, 2016
#z=0.25#
Explanation:
Given -
#n=54#
#SD=30#
#mu=12#
#mu_x=11#
Find the Standard Error -
#SE = sigma/sqrt(n)=30/sqrt(54)=30/7.35=4.08#
#z=(mu-mu_x)/(SE)=(12-11)/4.08=1/4.08=0.25#
#z=0.25#
