Question 981188
{{{SE=s/sqrt(N)=21.4/sqrt(27)=4.118}}}
Use t distribution with DOF=26 and 95%,
{{{t[c]=2.055}}}
{{{ME=SE*t[c]}}}
{{{ME=4.118*2.055}}}
{{{ME=8.463}}}
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({{{67.7}}},{{{84.7}}})