91Ó°ÊÓ

For each of the following, determine whether the statistical study described is an observational study or an experiment. Give a brief explanation of your choice. a. Can choosing the right music make wine taste better? This question was investigated by a researcher at a university in Edinburgh (www.decanter.com/wine-news /montes-music-makes-wine-reach-parts-it-otherwise -couldnt-reach-82325/, retrieved April 8,2017 ). Each of 250 volunteers was assigned at random to one of five rooms where they were asked to taste and rate a glass of wine. No music was playing in one of the rooms, and a different style of music was playing in each of the other four rooms. The researcher concludedFor each of the following, determine whether the statistical study described is an observational study or an experiment. Give a brief explanation of your choice. a. Can choosing the right music make wine taste better? This question was investigated by a researcher at a university in Edinburgh (www.decanter.com/wine-news /montes-music-makes-wine-reach-parts-it-otherwise -couldnt-reach-82325/, retrieved April 8,2017 ). Each of 250 volunteers was assigned at random to one of five rooms where they were asked to taste and rate a glass of wine. No music was playing in one of the rooms, and a different style of music was playing in each of the other four rooms. The researcher concluded that cabernet sauvignon is rated more highly when bold music is played than when no music is played. b. The article "Display of Health Risk Behaviors on MySpace by Adolescents" (Archives of Pediatrics and Adolescent Medicine [2009]: 27-34) described a study of 500 publically accessible MySpace web profiles posted by 18 -year- olds. The content of each profile was analyzed and the researchers concluded that those who indicated involvement in sports or a hobby were less likely to have references to risky behavior (such as sexual references or references to substance abuse or violence). c. USA TODAY (January 29,2003 ) reported that in a study of affluent Americans (defined as those with incomes of \$ 75,000\( or more per year) \)57 \%$ indicated that they would rather have more time than more money. d. The article "Acupuncture for Bad Backs: Even Sham Therapy Works" (Time, May 12,2009 ) summarized a study conducted by researchers at the Group Health Center for Health Studies in Seattle. In this study, 638 adults with back pain were randomly assigned to one of four groups. People in group 1 received the usual care for back pain. People in group 2 received acupuncture at a set of points tailored specifically for each individual. People in group 3 received acupuncture at a standard set of points typically used in the treatment of back pain. Those in group 4 received fake acupuncture- they were poked with a toothpick at the same set of points used for the people in group 3 . Two notable conclusions from the study were: (1) patients receiving real or fake acupuncture experienced a greater reduction in pain than those receiving usual care; and (2) there was no significant difference in pain reduction between those who received real acupuncture (groups 2 and 3 ) and those who received fake acupuncture toothpick pokes.

Step by step solution

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Study a. Music and Wine Tasting

In this research study, the volunteers were randomly assigned to one of five rooms with different music conditions. The responses of participants (taste and rating of wine) were then recorded and analyzed. This is an example of an experiment, as the researcher controlled the music conditions and randomly assigned volunteers to these different conditions.

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Study b. MySpace Health Risk Behaviors

In this study, researchers analyzed the content of 500 publicly accessible MySpace web profiles posted by 18-year-olds. They observed and recorded information on the profiles and looked for patterns between sports/hobby involvement and risky behavior display. This is an observational study because the researchers did not manipulate or control any factors or conditions; they simply observed existing data on the web profiles.

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Study c. Time vs. Money Affluent Americans Survey

The USA TODAY survey collected data from affluent Americans (those with incomes of $75,000 or more per year) and recorded their preferences for more time or more money. This is an observational study because the researchers did not manipulate or control any factors; they only gathered data from respondents about their preferences.

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Study d. Acupuncture and Back Pain

In this study, 638 adults with back pain were randomly assigned to one of four groups with different treatments for their back pain (usual care, individualized acupuncture points, standard acupuncture points, or fake acupuncture with a toothpick). This is an example of an experiment because the researchers actively assigned participants to different treatment groups and controlled the type of treatment given.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Observational Study

In an observational study, researchers meticulously collect data without actively interfering with the study subjects. Participants' behaviors or outcomes are observed as they naturally occur, allowing for the study of real-world dynamics. For instance, the analysis of MySpace profiles in regards to health risk behaviors falls into this category. Researchers gathered insights from the existing content, making this a passive approach to understanding the relationship between hobbies and risky behaviors. Observational studies are integral in fields such as epidemiology and social sciences, where manipulating the environment can be ethically or practically impossible.

However, a major limitation of these studies is that they can't establish causality definitively. Since researchers do not control variables, they can't be certain that observed relationships aren't influenced by unseen factors. This is why these studies are excellent for generating hypotheses but less so for confirming them directly.

Experiment

By contrast, an experiment is characterized by the active manipulation of variables. It's designed to test hypotheses under controlled conditions, which allows researchers to draw conclusions about cause and effect. For example, the wine tasting study that played different music in each room and the acupuncture research with various treatment groups are examples of experiments. By randomly assigning participants to different conditions and directly influencing their experiences, researchers gain the power to make stronger assertions about how one variable impacts another.

Experiments can be conducted in both natural settings and laboratories, with the aim of applying treatments or interventions consistently across groups. For education, this method is pivotal in scientifically exploring the efficacy of different teaching techniques or learning tools in improving student outcomes.

Random Assignment

Random assignment is a powerful tool within an experimental design that helps ensure that each participant has an equal chance of being placed in any treatment group. It's the lottery system of research, crucial for eliminating biases. The wine tasting and acupuncture studies utilized this technique, thereby minimizing preexisting differences among participants that could influence the outcome. By randomizing who receives which treatment—whether it's a type of music or an acupuncture intervention—researchers can be more confident that the results are due to the treatment itself rather than some other variable.

When used effectively, random assignment can enhance a study's internal validity, increasing the likelihood that the findings are trustworthy and accurately represent the effects of the treatments being tested.

Treatment Control

Finally, treatment control is an essential aspect of experimental design, referring to the regulation of variables other than the independent variable. Such control allows for a clear measurement of the effect a specific treatment has. In the acupuncture study, for example, the inclusion of fake acupuncture acts as a control that helps delineate the effects of real acupuncture from the placebo effect. By comparing different levels of treatment—standard care, individualized acupuncture, standard acupuncture points, and no acupuncture—we gain insights into what aspects of treatment (if any) are effective.

Effective control of treatments is vital as it contributes to the study's external validity, which is how well the results of the study can be generalized to the broader population. The more controlled and consistent the treatment application, the more confident one can be in replicating the study with similar results.