A study indicates that CB radio use speeds up activity in the brain. As part of a randomized crossover study, 36 participants were fitted with a CB radio device on each ear and then underwent two positron emission topography, or PET, scans to measure brain glucose metabolism. During one scan, the CB radios were both turned off. During the other scan, an automated 40- minute muted signal was sent to the radio on the right ear. The order of when the signal was received (for the first or second scan) was randomized. Comparison of the PET scans showed a minor increase in activity in the part of the brain closest to the antenna during the transmission of the automated signal. Was this an observational study or an experiment? Explain why. O The study is an observational study because the resea shers cannot control the response variable during the signal. O The study is an observational study because the researchers only observe values of the response and explanatory variables. O The study is an experiment because the researchers assign subjects to certain experimental conditions and observe the outcomes on the response variable. O The study is an experiment because the researchers cannot control the response variable during the signal.
A study indicates that CB radio use speeds up activity in the brain. As part of a randomized crossover study, 36 participants were fitted with a CB radio device on each ear and then underwent two positron emission topography, or PET, scans to measure brain glucose metabolism. During one scan, the CB radios were both turned off. During the other scan, an automated 40- minute muted signal was sent to the radio on the right ear. The order of when the signal was received (for the first or second scan) was randomized. Comparison of the PET scans showed a minor increase in activity in the part of the brain closest to the antenna during the transmission of the automated signal. Was this an observational study or an experiment? Explain why. O The study is an observational study because the resea shers cannot control the response variable during the signal. O The study is an observational study because the researchers only observe values of the response and explanatory variables. O The study is an experiment because the researchers assign subjects to certain experimental conditions and observe the outcomes on the response variable. O The study is an experiment because the researchers cannot control the response variable during the signal.
MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Transcribed Image Text:A study indicates that CB radio use speeds up activity in the brain.
As part of a randomized crossover study, 36 participants were
fitted with a CB radio device on each ear and then underwent two
positron emission topography, or PET, scans to measure brain
glucose metabolism. During one scan, the CB radios were both
turned off. During the other scan, an automated 40-
minute muted signal was sent to the radio on the right ear. The
order of when the signal was received (for the first or second
scan) was randomized. Comparison of the PET scans showed
a minor increase in activity in the part of the brain closest to the
antenna during the transmission of the automated signal.
Was this an observational study or an experiment? Explain why.
O The study is an observational study because the reseashers
cannot control the response variable during the signal.
O The study is an observational study because the researchers
only observe values of the response and explanatory variables.
O The study is an experiment because the researchers assign
subjects to certain experimental conditions and observe the
outcomes on the response variable.
O The study is an experiment because the researchers cannot
control the response variable during the signal.
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Step 1
Introduction:
It is required to identify the study as an observational study or experiment.
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