SOLUTION: Hi, can anyone help me here. Can you show me the steps. Thanks in advance A sample of 40 CDs from a student�s collection showed a mean length of 52.74 minutes with a standard de

Question 293125: Hi, can anyone help me here. Can you show me the steps. Thanks in advance
A sample of 40 CDs from a student�s collection showed a mean length of 52.74 minutes with a standard deviation of 13.21 minutes. Construct a 95 percent confidence interval for the population standard deviation.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A sample of 40 CDs from a student�s collection showed a mean length of 52.74 minutes with a standard deviation of 13.21 minutes. Construct a 95 percent confidence interval for the population standard deviation.
--------------------------------
Sample std = 13.21; Sample variance = 174.50
-----
df=39
lower Chi-Sq: 23.65 for df=39 and alpha/2 = 0.025
upper Chi-Sq: 58.12 for df=39 and alpha/2 = 0.025
--------
95% Confidence Interval:
[(39)(174.50)]/58.12 < s^2 < [(39)(174.50)]/23.65
==============
117.09 < s^2 < 287.76
==============
10.82 < s < 16.96
=======================
Cheers,
Stan H.
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