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A laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 208...

A laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 208 milligrams with s = 18.2 milligrams. Construct a 95 percent confidence interval for the true mean cholesterol content of all such eggs.


The mean replacement time for a random sample of 20 washing machines is 11.0 years and the standard deviation is 2.5 yearsConstruct a 99 % confidence interval for the standard deviation , o, of the replacement times of all washing machines of this type.

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