An experiment was conducted to investigate whether submersion in cold water causes a lower heart rate. The experiment used 50 volunteers. The 25 youngest volunteers had their heart rate measured while holding their breath for 30 seconds with their face submerged in cold water. The 25 oldest volunteers had their heart rate measured while holding their breath for 30 seconds with their face not submerged in cold water. The mean heart rate for volunteers who had their face submerged in cold water was lower than the mean heart rate for volunteers who did not have their face submerged in cold water. Which of the following elements of a well-designed experiment is missing? I. Comparison of at least two treatment groups II. Random assignment of treatments to experimental units III. Replication (A) I only (B) II only (C) I and II only (D) II and III only (E) I, II, and III
An experiment was conducted to investigate whether submersion in cold water causes a lower heart rate. The experiment used 50 volunteers. The 25 youngest volunteers had their heart rate measured while holding their breath for 30 seconds with their face submerged in cold water. The 25 oldest volunteers had their heart rate measured while holding their breath for 30 seconds with their face not submerged in cold water. The mean heart rate for volunteers who had their face submerged in cold water was lower than the mean heart rate for volunteers who did not have their face submerged in cold water. Which of the following elements of a well-designed experiment is missing? I. Comparison of at least two treatment groups II. Random assignment of treatments to experimental units III. Replication (A) I only (B) II only (C) I and II only (D) II and III only (E) I, II, and III
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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Transcribed Image Text:An experiment was conducted to investigate whether submersion in cold water causes a lower heart rate. The
experiment used 50 volunteers. The 25 youngest volunteers had their heart rate measured while holding their breath
for 30 seconds with their face submerged in cold water. The 25 oldest volunteers had their heart rate measured
while holding their breath for 30 seconds with their face not submerged in cold water. The mean heart rate for
volunteers who had their face submerged in cold water was lower than the mean heart rate for volunteers who did
not have their face submerged in cold water.
Which of the following elements of a well-designed experiment is missing?
I. Comparison of at least two treatment groups
II. Random assignment of treatments to experimental units
III. Replication
(A) I only
(B) II only
(C) I and II only
(D) II and III only
(E) I, II, and III
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