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Chapter 1: Problem 64

According to the article "Effect of Preparation Methods on Total Fat Content, Moisture Content, and Sensory Characteristics of Breaded Chicken Nuggets and Beef Steak Fingers" (Family and Consumer Sciences Research Journal [1999]: 18-27), sensory tests were conducted using 40 college student volunteers at Texas Women's University. Give three reasons, other than the relatively small sample size, why it would not be a good idea to generalize any study results to the population of all college students.

Short Answer

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Three reasons, other than the relatively small sample size, why it would not be a good idea to generalize any study results to the population of all college students include: 1. Demographic Characteristics: The study was conducted at Texas Women's University, which likely has different demographic characteristics than other colleges and possibly only includes female students, making it difficult to generalize findings to male college students. 2. Sampling Methods: We don't know how the 40 student volunteers were selected; if researchers did not use a random sampling method, the study results may have been influenced by self-selection bias, affecting the representativeness of the sample. 3. Subject of the Study: The study focuses on the sensory characteristics of breaded chicken nuggets and beef steak fingers, which might not be relevant to all college students, especially those who follow vegetarian or vegan diets. Generalizing the results of such a specific study to a broader population could yield inaccurate conclusions.

Step by step solution

01

Reason 1: Demographic Characteristics

The first reason why it would be inappropriate to generalize study results from the given sample to all college students is that the study was conducted at Texas Women's University, which likely has different demographic characteristics than other colleges and universities. For example, attending an all-women's university means the entire sample is composed of female students, making it difficult to generalize findings to male college students.
02

Reason 2: Sampling Methods

Another reason why it would not be a good idea to generalize the study results is the sampling methods. We don't know how the 40 student volunteers were selected for the study. If researchers did not use a random sampling method, the study results may have been influenced by self-selection bias, whereby only students interested in the topic or those who had strong opinions about breaded chicken nuggets and beef steak fingers participated in the study. This means the participants might not be representative of all college students.
03

Reason 3: Subject of the Study

Lastly, one must consider the subject of the study before generalizing the results. This study focuses on the effect of preparation methods on the sensory characteristics of breaded chicken nuggets and beef steak fingers. While this might be an interesting topic to the students involved in the study, it might not be relevant to all college students, especially those who follow vegetarian or vegan diets. Generalizing the results of such a specific study to a broader population could yield inaccurate conclusions for those not directly related to the subject matter.

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Key Concepts

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

Sampling Bias
Sampling bias occurs when certain individuals or groups are more likely to be selected than others, leading to a non-representative sample. In the case of the study conducted at Texas Women's University, understanding selection methods is crucial. If the participants were invited based on their specific interest in chicken nuggets and beef steak fingers, or if they volunteered based on personal preferences, this could lead to sampling bias.

Additionally, the lack of random sampling implies self-selection bias, where only those with a particular interest or opinion on the subject may have participated. This makes it difficult to derive conclusions applicable to all college students. Therefore, when conducting studies that aim for broader applicability, it's important to ensure random and unbiased sampling techniques are used to collect data.

To minimize sampling bias:
  • Use random sampling methods whenever possible.
  • Avoid relying solely on volunteers with specific interests in the study's topic.
  • Ensure diversity within the sample, covering various aspects of the target population.
Demographic Characteristics
Demographic characteristics refer to the statistical traits of a human population, including attributes like age, gender, ethnicity, and socio-economic status. When assessing the validity of a study's results, considering demographic characteristics ensures that findings can accurately represent a broader group.

In the case of the Texas Women's University study, all participants were from an all-women's institution. Hence, the demographic composition was entirely female. This skews any potential generalization of the study findings to all college students, which includes males and potentially different cultural backgrounds.

Ignoring demographic diversity leads to conclusions that might only hold true for the specific group tested. For credible research conclusions that apply to all college students, the sample should include a mix of demographics reflecting the entire population.

Important considerations for demographic characteristics include:
  • Identifying key attributes relevant to the study's outcomes.
  • Ensuring a balanced representation in the sample.
  • Understanding how different demographic characteristics can influence the study's results.
Population Validity
Population validity refers to the extent to which study findings can be generalized from the sample studied to a wider population. In this case, it's questionable due to the specific nature of the sample: college students from a single university with distinct characteristics and interests.

The topic itself鈥攑ertaining to the preparation methods of breaded chicken nuggets and beef steak fingers鈥攎ight not resonate with a broader student population. This is especially true for those who may have different dietary restrictions or preferences, such as vegetarians or vegans. As such, the findings might not hold the same relevance or accuracy across diverse dietary habits present among all college students.

For a study to achieve high population validity, it should effectively consider:
  • Relevance of the study topic to the entire target population.
  • Diversity and representativeness of the sample in terms of dietary and cultural factors.
  • Avoidance of overly specific or niche topics that do not pertain to the broader population's experiences.
By ensuring these factors are addressed, researchers can enhance the population validity of their studies.

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Most popular questions from this chapter

Pismo Beach, California, has an annual clam festival that includes a clam chowder contest. Judges rate clam chowders from local restaurants. The judges are not aware of which chowder is from which restaurant when they assign the ratings. One year, much to the dismay of the seafood restaurants on the waterfront, Denny's chowder was declared the winner! (When asked what the ingredients were, the cook at Denny's said he wasn't sure- he just had to add the right amount of nondairy creamer to the soup stock that he got from Denny's distribution center!) a. Do you think that Denny's chowder would have won the contest if the judging had not been "blind"? Explain. b. Although this was not an experiment, your answer to Part (a) helps to explain why those measuring the response in an experiment are often blinded. Using your answer in Part (a), explain why the results might have been different if the judges had known which restaurant-including Denny's- had prepared each of the clam chowders.

"Pecans Lower Cholesterol" is a headline that appeared in the magazine Woman's World (November 1 , 2010). Consider the following five study descriptions. For each of the study descriptions, answer these five questions: Question 1: Is the described study an observational study or an experiment? Question 2: Did the study use random selection from some population? Question 3: Did the study use random assignment to experimental groups? Question 4: Would the conclusion "pecans lower cholesterol" be appropriate given the study description? Explain. Question 5: Would it be reasonable to generalize conclusions from this study to some larger population? If so, what population? Study 1: Five hundred students were selected at random from those enrolled at a large college in Florida. Each student in the sample was asked whether they ate pecans more than once in a typical week, and their cholesterol levels were also measured. The average cholesterol level was significantly lower for the group who ate pecans more than once a week than for the group that did not. Study 2: One hundred people who live in Los Angeles volunteered to participate in a statistical study. The volunteers were divided based on gender, with women in group 1 and men in group \(2 .\) Those in group 1 were asked to eat 3 ounces of pecans daily for 1 month. Those in group 2 were asked not to eat pecans for 1 month. At the end of the month, the average cholesterol level was significantly lower for group 1 than for group 2 Study 3: Two hundred people volunteered to participate in a statistical study. Each person was asked how often he or she ate pecans, and their cholesterol levels were also measured. The average cholesterol level for those who ate pecans more than once a week was significantly lower than the average cholesterol level for those who did not eat pecans. Study 4: Two hundred people volunteered to participate in a statistical study. For each volunteer, a coin was tossed. If the coin landed heads up, the volunteer was assigned to group 1 . If the coin landed tails up, the volunteer was assigned to group 2 . Those in group 1 were asked to eat 3 ounces of pecans daily for 1 month. Those in group 2 were asked not to eat pecans for 1 month. At the end of the month, the average cholesterol level was significantly lower for group 1 than for group 2 . Study 5: One hundred students were selected at random from those enrolled at a large college. Each of the selected students was asked to participate in a study, and all agreed to participate. For each student, a coin was tossed. If the coin landed heads up, the student was assigned to group 1 . If the coin landed tails up, the student was assigned to group \(2 .\) Those in group 1 were asked to eat 3 ounces of pecans daily for 1 month. Those in group 2 were asked not to eat pecans for 1 month. At the end of the month, the average cholesterol level was significantly lower for group 1 than for group 2 .

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.

The article "Why We Fall for This" (AARP Magazine, May/June 2011) described a study in which a business professor divided his class into two groups. He showed students a mug and then asked students in one of the groups how much they would pay for the mug. Students in the other group were asked how much they would sell the mug for if it belonged to them. Surprisingly, the average values assigned to the mug were quite different for the two groups! Indicate whether the study is an observational study or an experiment. Give a brief explanation for your choice.

The article "Doctor Dogs Diagnose Cancer by Sniffing It Out" (Knight Ridder Newspapers, January 9, 2006) refers to an experiment described in the journal Integrative Cancer Therapies. In this experiment, dogs were trained to distinguish between people with breast and lung cancer and people without cancer by sniffing exhaled breath. Dogs were trained to lie down if they detected cancer in a breath sample. After training, the dogs' ability to detect cancer was tested using breath samples from people whose breath had not been used in training the dogs. The paper states, "The researchers blinded both the dog handlers and the experimental observers to the identity of the breath samples." Explain why this blinding is an important aspect of the design of this experiment.
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