Introduction To Statistics And Data Analysis
6th Edition
ISBN: 9781337793612
Author: PECK, Roxy.
Publisher: Cengage Learning,
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Textbook Question
Chapter 2, Problem 77CR
The paper “Effect of a Nutritional Supplement on Hair Loss in Women” (Journal of Cosmetic Dermatology [2015]: 76-82) describes an experiment to see if a dietary supplement consisting of Omega 3, Omega 6, and antioxidants could reduce hair loss in women with stage 1 hair loss. One hundred twenty women volunteered to participate in the study and were randomly assigned to either the supplement group or a control group. The women in the supplement group took the supplement for 6 months. Photos of the top of the head were taken of all the women at the beginning of the study and 6 months later at the end of the study. The two photos of each woman were evaluated by an independent expert who visually determined the change in hair density. The expert who determined the change in hair density did not know which of the women had taken the supplement.
- a. Evaluate this experimental design. Do you think this is a good design or a poor design, and why?
- b. If you were designing such a study, what, if anything, would you propose to do differently?
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Chapter 2 Solutions
Introduction To Statistics And Data Analysis
Ch. 2.1 - The article How Dangerous Is a Day in the...Ch. 2.1 - The authors of the paper Fudging the Numbers:...Ch. 2.1 - The article Why We Fall for This (AARP Magazine,...Ch. 2.1 - The article Adolescents Living the 24/7 Lifestyle:...Ch. 2.1 - The article Acupuncture for Bad Backs: Even Sham...Ch. 2.1 - The article Display of Health Risk Behaviors on...Ch. 2.1 - The article Popping Cork Sound Makes Wine Taste...Ch. 2.1 - Fruit Juice May Be Fueling Pudgy Preschoolers,...Ch. 2.1 - The article Americans are Getting the Wrong Idea...Ch. 2.1 - Based on a survey conducted on the eDiets.com web...
Ch. 2.1 - A survey of adult Americans who are Internet users...Ch. 2.1 - Does sitting for long periods of time hurt your...Ch. 2.2 - A New York psychologist recommends that if you...Ch. 2.2 - As part of a curriculum review, a psychology...Ch. 2.2 - A petition with 500 signatures is submitted to a...Ch. 2.2 - The article Bicyclists and Other Cyclists (Annals...Ch. 2.2 - The article Teenage Physical Activity Reduces Risk...Ch. 2.2 - For each of the situations described, state...Ch. 2.2 - Of the 6500 students enrolled at a community...Ch. 2.2 - Briefly explain why it is advisable to avoid the...Ch. 2.2 - A sample of pages from this book is to be...Ch. 2.2 - The chairman of a California ballot initiative...Ch. 2.2 - The authors of the paper Digital Inequality:...Ch. 2.2 - The 2013 National Study of Substance Use Habits of...Ch. 2.2 - The paper Deception and Design: The Impact of...Ch. 2.2 - The authors of the paper Playing by the Rules:...Ch. 2.2 - Participants in a study of honesty in online...Ch. 2.2 - The article Credit Card Activity for College...Ch. 2.2 - The financial aid advisor of a university plans to...Ch. 2.2 - Suppose that you were asked to help design a...Ch. 2.2 - The article High Levels of Mercury Are Found in...Ch. 2.2 - Whether or not to continue a Mardi Gras Parade...Ch. 2.3 - The head of the quality control department at a...Ch. 2.3 - A study of college students showed a temporary...Ch. 2.3 - According to the article Rubbing Hands Together...Ch. 2.3 - The following is from an article titled After the...Ch. 2.3 - The report Comparative Study of Two Computer Mouse...Ch. 2.3 - The Institute of Psychiatry at Kings College...Ch. 2.3 - In an experiment to compare two different surgical...Ch. 2.3 - In many digital environments, users are allowed to...Ch. 2.3 - Does playing action video games provide more than...Ch. 2.3 - Construct a diagram to represent the note-taking...Ch. 2.3 - Construct a diagram to represent the gasoline...Ch. 2.3 - An advertisement for a sweatshirt that appeared in...Ch. 2.3 - The paper Turning to Learn: Screen Orientation and...Ch. 2.3 - Consider the study described in the previous...Ch. 2.3 - The Pew Research Center conducted a study of...Ch. 2.3 - Consider the study described in the previous...Ch. 2.3 - Red wine contains flavonol, an antioxidant thought...Ch. 2.4 - Explain why some studies include both a control...Ch. 2.4 - Explain why blinding is a reasonable strategy in...Ch. 2.4 - Give an example of an experiment for each of the...Ch. 2.4 - The article Study Points to Benefits of Knee...Ch. 2.4 - In an experiment to compare two different surgical...Ch. 2.4 - The article Placebos Are Getting More Effective....Ch. 2.4 - The article Yes That Miley Cyrus Biography Helps...Ch. 2.4 - Suppose that the researchers who carried out the...Ch. 2.4 - The article Doctor Dogs Diagnose Cancer by...Ch. 2.4 - Pismo Beach, California, has an annual clam...Ch. 2.4 - The San Luis Obispo Tribune (May 7, 2002) reported...Ch. 2.4 - The article A Debate in the Dentists Chair (San...Ch. 2.5 - The article Effects of Too Much TV Can Be Undone...Ch. 2.5 - Prob. 66ECh. 2 - A mortgage lender routinely places advertisements...Ch. 2 - The article Rethinking Calcium Supplements (US...Ch. 2 - A pollster for the Public Policy Institute of...Ch. 2 - A study in Florida is examining whether health...Ch. 2 - The press release Men Need to Man Up, According to...Ch. 2 - A news release from Intel Intels Security...Ch. 2 - USA TODAY (August 25, 2015) reported that American...Ch. 2 - The paper Effect of a Nutritional Supplement on...Ch. 2 - A manufacturer of clay roofing tiles would like to...Ch. 2 - A tropical forest survey conducted by Conservation...
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