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What confidence coefficient was used to generate the confidence​ intervals?

What confidence coefficient was used to generate the confidence​ intervals?

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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What confidence coefficient was used to generate the confidence​ intervals?

The heart rate variability (HRV) of police officers was the subject of research published in a biology journal. HRV is defined as the variation in the time intervals between heartbeats. A measure of HRV was obtained for each in a sample of 303 police officers from the same city. (The lower the measure of HRV, the more susceptible the officer is to cardiovascular disease.) For the 73 officers diagnosed with hypertension, a 99% confidence interval for the mean HRV was (6.7,128.9). For the 230 officers that are not hypertensive, a 99% confidence interval for the mean HRV was (144.1,189.2). Use this information to complete parts a through d below.
Transcribed Image Text:The heart rate variability (HRV) of police officers was the subject of research published in a biology journal. HRV is defined as the variation in the time intervals between heartbeats. A measure of HRV was obtained for each in a sample of 303 police officers from the same city. (The lower the measure of HRV, the more susceptible the officer is to cardiovascular disease.) For the 73 officers diagnosed with hypertension, a 99% confidence interval for the mean HRV was (6.7,128.9). For the 230 officers that are not hypertensive, a 99% confidence interval for the mean HRV was (144.1,189.2). Use this information to complete parts a through d below.
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