Question 1173033
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Hi, 
c​=.90,o=7.2 ​,and E=2
ME ={{{( z*sigma)/sqrt(n)}}}
n = {{{((1.645*7.2)/2)^2)}}}  = 35.07  0r 36 is the sample size needed

 = CI	z = value
90%	z =1.645
92%	z = 1.751
95%	z = 1.96
98%	z = 2.326
99%	z = 2.576