Infrasound refers to sound waves or vibrations with a frequency below the audibility range of the human
Question:
Infrasound refers to sound waves or vibrations with a frequency below the audibility range of the human ear. Even though infrasound cannot be heard, it can produce physiological effects in humans. Mechanical science engineers in China studied the impact of infrasound on a person’s blood pressure and heart rate (Journal of Low Frequency Noise, Vibration and Active Control, Mar. 2004). Six university students were exposed to infrasound for 1 hour. The table gives the blood pressure and heart rate for each student, both before and after exposure.
a. Compare the before and after mean systolic blood pressure readings using a 99% confidence interval. Interpret the result.
b. Compare the before and after mean diastolic blood pressure readings using a 99% confidence interval. Interpret the result.
c. Compare the before and after mean heart rate readings using a 99% confidence interval. Interpret the result.
Step by Step Answer:
Statistics For Engineering And The Sciences
ISBN: 9781498728850
6th Edition
Authors: William M. Mendenhall, Terry L. Sincich