Register
n a study of 250 adults, the mean heart rate was 70 beats per minute. Assume the population of heart rates is known to be approximately normal with a standard deviation of 12 beats per minute. What is
125k views
1 vote
n a study of 250 adults, the mean heart rate was 70 beats per minute. Assume the population of heart rates is known to be approximately normal with a standard deviation of 12 beats per minute. What is the 99% confidence interval for the mean beats per minute?

User Johndt
by
8.6k points

1 Answer

6 votes
We are given mean = 70, SD = 12, sample size n = 250, and for a 99% confidence interval, the two-tailed z-score is +/-2.58.
The CI bounds are calculated as:
mean +/- z*SD/sqrt(n) = 70 +/- 2.58*12/sqrt(250) = 68.04 to 71.96 beats per minute
User Isobel
by
7.9k points
Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.5m questions

12.2m answers

Other Questions

How do you can you solve this problem 37 + y = 87; y =
What is .725 as a fraction
How do you estimate of 4 5/8 X 1/3
A bathtub is being filled with water. After 3 minutes 4/5 of the tub is full. Assuming the rate is constant, how much longer will it take to fill the tub?
Write words to match the expression. 24- ( 6+3)
Link Copied!