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A sample of 25 two-year old chickens shows that they lay an average of 21 eggs...

A sample of 25 two-year old chickens shows that they lay an average of 21 eggs per month.  the standard deviation of the sample was 2 eggs.  Find the 90% confidence interval of the true mean.

For a group of 10 men subjected to a stress situation, the mean number of heartbeats per minute was 126, and the standard deviation was 4.  Find the 95% confidence interval of the true mean.

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