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December 21, 2014

Homework Help: Stats

Posted by Tyler on Thursday, December 19, 2013 at 4:21am.

Suppose the following data are selected randomly from a population of normally distributed values.

42
51 43 48 41 57 54
39 45 48 45 39 46

Construct a 95% confidence interval to estimate the population mean.

Round the intermediate values to 2 decimal places. Round your answers to 2 decimal places, the tolerance is +/-0.05.



I do not understand how to find the 's' for the estimate of standard deviation from the sample.
n=13
xbar=46
df= 12
alpha/2= 0.025
Therefore, t= 2.179
And I am stuck...

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