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...

- Stats -
**Kuai**, Thursday, December 19, 2013 at 2:37pm
n=13

xbar=46

df= 12

alpha/2= 0.025

Therefore, t= 2.179

Sd = 5.5377

t = 2.179

(42.65, 49.35)

Z = 1.96

(42.99,49.01)

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