Men's Pulse Rates
A random sample of 25 men's resting pulse rates shows a mean of 72 beats per minute and a standard deviation of 13.
a. Find a 95% confidence interval for the population mean pulse rate for men, and report it in a sentence. You may use the table given for Exercise .
b. Find a 99% confidence interval.
c. Which interval is wider and why?
Exercise
t* A researcher collects one sample of 27 measurements from a population and wants to find a 95% confidence interval. What value should he use for t*? (Recall that df = n - 1 for a one-sample t-interval.)
