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 ago
Next > < Previous

Related 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 underweight, overweight, or 'medium...
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...
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 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 in...
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 equally sized groups. One group was shown a short video on how to fold paper cranes. The other group was given an instruction booklet on how to do so. They were then asked to make paper cranes for the next hour. The number of paper cranes each subject made was 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 regular 30-minute workout could slash your risk of catching a cold by 43%. 20. The Journal of Behavioral Medicine reported that sharing a hug and holding hands can limit the physical effects of stress such as...
(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...
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT