Men’s Pulse Rates (Example 10) 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 9.25 . b. Find a 99 % confidence interval. c. Which interval is wider, and why?
Men’s Pulse Rates (Example 10) 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 9.25 . b. Find a 99 % confidence interval. c. Which interval is wider, and why?
Solution Summary: The author determines the 95% confidence interval for the population mean of men resting pulse rate, using the table from 9.25.
Men’s Pulse Rates (Example 10) 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
9.25
.
b. Find a
99
%
confidence interval.
c. Which interval is wider, and why?
Definition Definition Number of subjects or observations included in a study. A large sample size typically provides more reliable results and better representation of the population. As sample size and width of confidence interval are inversely related, if the sample size is increased, the width of the confidence interval decreases.
Statistics: Informed Decisions Using Data (5th Edition)
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