# Confidence Interval Estimation

A certain medication is known to increase the pulse rate of its users. The standard deviation of the pulse rate is know to be 4 beats per minute. A sample of 40 users had an average pulse rate of 98 beats per minute. Find the 95% confidence interval of the true mean (of the population)?

Give at least 2 properties of a good estimator

What do we mean by a 95% confidence interval?

A certain medication is known to increase the pulse rate of its users. The standard deviation of the pulse rate is know to be 4 beats per minute. A sample of 40 users had an average pulse rate of 98 beats per minute. Find the 95% confidence interval of the true mean (of the population)?

If one wanted to increase the confidence interval would you expect to decrease or increase the interval?

A nurse wants to estimate the birth weight of infants. How large of a sample must she select if she desires to be 95% confident that the true mean is within 5 ounces of the sample mean? The standard deviation in known to be 8 ounces.

For a group of men subjected to a stress situation, the mean of the 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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#### Solution Summary

Calculation of confidence interval for mean and properties of estimators.