A laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 240 milligrams with s = 19.8 milligrams. Construct a 95%confidence interval for the true mean cholesterol content of all such eggs.

**Solution: **The 95% confidence interval for the true mean cholesterol content is given by

_{}

where_{},_{}and_{}. Therefore, the confidence interval is written as

_{}

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