Question 155280
given the following raw scores on a standard 10 point scale. 
Calculate the 95% confidence interval (use the t-score method) 
the interval is from ___ to___

10,8,4,4,6,2,3,2,2,5,3,8,5,7,9,9,6,9,5,4,1,5,4,2,8,
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sample mean = 5.083333...
sigma = 2.586195...
n= 25
t* = 2.064 is the t-value for 95% confidence and df=24
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E = 2.064[2.586195/sqrt(25)] = 1.067581
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95% CI: 5.083333-1.067581.. < u < 5.083333+1.067581..
95% CI: 4.015752.. < u < 6.150914...  
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Cheers,
Stan H.