Random sample with 95% confidence interval...I'm lost?

A random sample of n=12 cans of soup produced by Chuncky Style provides the weights, measured in ounces in the table below. What is the 95% confidence interval for the standard deviation of the populations? (%26lt;_ is less than or equl to)





ounces of soup per can


12.2


11.9


12.0


12.2


11.7


11.6


11.9


12.0


12.1


12.3


11.8


11.9





a .0222 %26lt;_ stan dev %26lt;_ .1274


b .0645 %26lt;_ stan dev %26lt;_ .1274


c .0876 %26lt;_ stan dev%26lt;_ .1348


d .1348 %26lt;_ stan dev%26lt;_ .2174


e. none





Thank you

Random sample with 95% confidence interval...I'm lost?
Alex: is the same procedure of this:





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