<PRE><B>Question 1178567</B>
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Hi
ME ={{{ t*sigma/sqrt(n)}}}
t(df10) = 2.228
ME ={{{ 2.228*2.4/sqrt(11)}}} = 1.6
15.6 - 1.6 &lt; {{{mu}}} &lt; 15.6 + 1.6
CI:  ( 14, 17.2)
Wish You the Best in your Studies.
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