In each case below, we describe a study to determine whether exercise helps increase certain mood enhancing chemicals in the brain. Indicate whether each describes an experiment or an observational study. (1) We contact a random sample of 100 people and record how much each person exercises and also measure the chemicals in the brain for each person. (2) Using a random sample of 100 people, we randomly assign half of them to participate in a regular exercise program for a six-week period while the other half makes no changes. At the end of the time period, we measure the brain chemicals.
In each case below, we describe a study to determine whether exercise helps increase certain mood enhancing chemicals in the brain. Indicate whether each describes an experiment or an observational study. (1) We contact a random sample of 100 people and record how much each person exercises and also measure the chemicals in the brain for each person. (2) Using a random sample of 100 people, we randomly assign half of them to participate in a regular exercise program for a six-week period while the other half makes no changes. At the end of the time period, we measure the brain chemicals.
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:In each case below, we describe a study to determine whether exercise helps increase certain mood
enhancing chemicals in the brain. Indicate whether each describes an experiment or an observational
study.
(1) We contact a random sample of 100 people and record how much each person exercises and
also measure the chemicals in the brain for each person.
(2) Using a random sample of 100 people, we randomly assign half of them to participate in a
regular exercise program for a six-week period while the other half makes no changes. At
the end of the time period, we measure the brain chemicals.
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