MATH 225N WEEK 1 EVIDENCE, CLAIMS, AND TYPES
QUESTIONS AND ANSWERS
1. A study is planned to research the effects of drinking coffee on
hours of sleep. Would an experimental or observational study
design be more appropriate?
An observational study should be used because it is not possible to
control whether or not a person drinks coffee.
An observational study should be used because it is not possible to
control the number of hours of sleep a person has.
An experimental study should be used where the consumption of
coffee is the experimental factor.
An experimental study should be used where the number of hours of
sleep is the experimental factor.
2. A researcher is interested in the effects of watching videos just
before bed on the quality of sleep. Which of the following
claims would be appropriate for this situation? Select only one
answer choice.
Watching videos just before bed reduces quality of sleep.
More than 60% of people watch videos just before going to bed.
, Watching 1 hour of video just before going to bed reduces the
number of minutes of REM sleep by more than 10%.
Watching 1 hour of video just before going to bed reduces the
quality of sleep.
3. In a psychological study aimed at testing a medicine for
reducing stress levels, the researcher grouped the participants
into 2groups and gave the stress-reduction pill to one group
and a placebo pill to another group. In the description of the
above situation, determine the experimental group.
The group that received the stress-reduction pill is the experimental
group.
The group that received the placebo pill is the experimental group.
Both the groups are experimental groups.
Neither group is an experimental group.
4. In a survey conducted to find out the feedback of a sports
program organized in a club, the organizers asked the
respondents to classify their feedback as good, fair, poor, and
bad. Is the study observational or experimental? If it is an
experiment, what is the controlled factor?
The study is an observational study.
The study is an experiment. The controlled factor is the feedback.
QUESTIONS AND ANSWERS
1. A study is planned to research the effects of drinking coffee on
hours of sleep. Would an experimental or observational study
design be more appropriate?
An observational study should be used because it is not possible to
control whether or not a person drinks coffee.
An observational study should be used because it is not possible to
control the number of hours of sleep a person has.
An experimental study should be used where the consumption of
coffee is the experimental factor.
An experimental study should be used where the number of hours of
sleep is the experimental factor.
2. A researcher is interested in the effects of watching videos just
before bed on the quality of sleep. Which of the following
claims would be appropriate for this situation? Select only one
answer choice.
Watching videos just before bed reduces quality of sleep.
More than 60% of people watch videos just before going to bed.
, Watching 1 hour of video just before going to bed reduces the
number of minutes of REM sleep by more than 10%.
Watching 1 hour of video just before going to bed reduces the
quality of sleep.
3. In a psychological study aimed at testing a medicine for
reducing stress levels, the researcher grouped the participants
into 2groups and gave the stress-reduction pill to one group
and a placebo pill to another group. In the description of the
above situation, determine the experimental group.
The group that received the stress-reduction pill is the experimental
group.
The group that received the placebo pill is the experimental group.
Both the groups are experimental groups.
Neither group is an experimental group.
4. In a survey conducted to find out the feedback of a sports
program organized in a club, the organizers asked the
respondents to classify their feedback as good, fair, poor, and
bad. Is the study observational or experimental? If it is an
experiment, what is the controlled factor?
The study is an observational study.
The study is an experiment. The controlled factor is the feedback.
