Question 1050519
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Hi  
 CI	z = value
90%	z =1.645
92%	z = 1.751
95%	z = 1.96
98%	z = 2.326
99%	z = 2.576
95% Confidence Interval:  z = 1.96,  n = 99, m = 285
ME ={{{ z*sigma/sqrt(n)}}}
ME = 1.96*60/sqrt(99) = 11.82
285 - ME < {{{mu}}} < 285+ ME
285 - 11.82 < {{{mu}}} < 285+ 11.82
273.18 &#8804; &#956; &#8804; 296.82