Question 975592
From your samples,
{{{mu=4344.6}}}
{{{s=397.2}}}
Since there are only 12 samples compute the t statistic using the critical t value for 95% and 11 dof.
{{{t[c]=2.201}}}
So then,
{{{E=2.201*(397.2/sqrt(12))}}}
{{{E=252.3}}}
So then the interval is,
({{{4344.6-252.3}}},{{{4344.6+252.3}}})
({{{4092.3}}},{{{4596.9}}})