Question
In: Statistics and Probability
For Exercises determine whether an observational study or an experimental study was used. Subjects are randomly assigned to three groups. Group 1 receives a placebo daily, group 2 receives a high dose of vitamin B daily,
For Exercises determine whether an observational study or an experimental study was used.
Subjects are randomly assigned to three groups. Group 1 receives a placebo daily, group 2 receives a high dose of vitamin B daily, and group 3 receives a multivitamin daily. After 3 months, each participant is asked how many incidents of depression that she or he had, and the occurrences were compared.
Solutions
Expert Solution
Check whether the given study is experimental or observational.
The given study is an experimental study.
Reason:
Here, the subjects are randomly assigned to three groups and are given different treatments (a placebo, high dose of vitamin B, and multivitamin). In other words, the explanatory variable is manipulated. Then, the number of incidents of depression (dependent variable) is noted for subjects in each of the groups. Therefore, it is clear that the type of treatment given to each group was manipulated and the number of incidents of depression was noted.
The given study is an experimental study.
Hafiz answered 1 year agoRelated Solutions
Depressed patients were randomly assigned to one of three groups: a placebo group, a group that...
Depressed patients were randomly assigned to one of three
groups: a placebo group, a group that received a moderate dose of
the drug, and a group that received a high dose of the drug. After
four weeks of treatment, the patients completed the Beck Depression
Inventory. The higher the score, the more depressed the
patient.
We are now also interested if a patient's weight has an effect
on the drug's effectiveness. Patients were categorized as either
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Depressed patients were randomly assigned to one of three groups: a placebo group, a group that...
Depressed patients were randomly assigned to one of three
groups: a placebo group, a group that received a moderate dose of
the drug, and a group that received a high dose of the drug. After
four weeks of treatment, the patients completed the Beck Depression
Inventory. The higher the score, the more depressed the
patient.
We are now also interested if a patient's weight has an effect
on the drug's effectiveness. Patients were categorized as either
underweight, overweight, or 'medium...
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The researcher looked at three different ratings of the
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if there is a difference in the modes of presentation. In
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A researcher randomly assigns 33 subjects to one of three groups. Group 1 receives technical dietary...
A researcher randomly assigns 33 subjects to one of three
groups. Group 1 receives technical dietary information
interactively from an on-line website. Group 2 receives the same
information from a nurse practitioner, while Group 3 receives the
information from a video tape made by the same nurse
practitioner.
The researcher looked at three different ratings of the
presentation; difficulty, usefulness, and importance to determine
if there is a difference in the modes of presentation. In
particular, the researcher is interested...
12 subjects in a study were randomly assigned into two equally sized groups. One group was...
12 subjects in a study were randomly assigned into two
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recorded and is listed in the table below. The researchers are
interested in whether there was a difference in the...
Exercises 1–4 1. Explain the difference between an observational and an experimental study. 2. Name and...
Exercises 1–4
1. Explain the difference between an observational and
an
experimental study.
2. Name and define the three types of observational
studies.
In Exercises 19–22, identify the independent variable and the
dependent variable.
19. According to the British Journal of Sports Medicine, a
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by 43%.
20. The Journal of Behavioral Medicine reported that sharing a
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(60) 15 subjects were assigned randomly to one of three diet regimens: Diet 1, Diet 2...
(60) 15 subjects were assigned randomly to one of three diet
regimens: Diet 1, Diet 2 and Diet 3. The weights of the subjects
are listed as the response variable. The output of the analysis is
below.
Df
Sum Sq
Mean Sq
F value
Pr(>F)
Response
1
0.943
0.9430
1.354
0.266
Residuals
13
9.057
0.6967
What test was conducted?
What was the research question (null and alternative hypothesis
in words)?
State the null hypothesis.
State the alternative hypothesis.
What...
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