Question 1198504
<pre><font face = "consolas" color = "indigo" size = 3><b>
{{{ME = z*sigma/sqrt(n)}}}  , {{{ME = 1.645*19.9/sqrt(969)}}} = .840
83.5- .840 < {{{mu}}} < 83.4 + .840
82.66 < {{{mu}}} < 84.34

 = CI	z = value
90%	z =1.645
92%	z = 1.751
95%	z = 1.96
98%	z = 2.326
99%	z = 2.576
</font></b></pre>