Question 1049192
{ 2, 1.5, 3, 2, 3.5, 1, 0.5, 3, 2, 4 }
 x̄ = 2.25
s = 1.11
For a population with unknown mean  and unknown standard deviation , 
a confidence interval for the population mean is: CI = x̄ ± {{{t*s/sqrt(n)}}}
CI = 2.25 ± {{{t*1.11/sqrt(10)}}} 
95% confidence level, Degree of Freedom(n-1) = 9: t = 2.26 (use Calculator 0r table)
CI = 2.25 ± {{{2.26*1.11/sqrt(10)}}} 
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90% confidence level, Degree of Freedom(n-1) = 9: t = 1.83 (use Calculator 0r table)
CI = 2.25 ± {{{1.83*1.11/sqrt(10)}}}