/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 72 The article "Display of Health R... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 1: Problem 72

The article "Display of Health Risk Behaviors on MySpace by Adolescents" (Archives of Pediatrics and Adolescent Medicine [2009]: \(27-34\) ) described a study in which researchers looked at a random sample of 500 publicly accessible MySpace web profiles posted by 18-year-olds. The content of each profile was analyzed. One of the conclusions reported was that displaying sport or hobby involvement was associated with decreased references to risky behavior (sexual references or references to substance abuse or violence). a. Is it reasonable to generalize the stated conclusion to all 18-year-olds with a publicly accessible MySpace web profile? What aspect of the study supports your answer? b. Not all MySpace users have a publicly accessible profile. Is it reasonable to generalize the stated conclusion to all 18-year-old MySpace users? Explain. c. Is it reasonable to generalize the stated conclusion to all MySpace users with a publicly accessible profile? Explain.

Short Answer

Expert verified
a) It is reasonable to generalize to all 18-year-olds with publicly accessible MySpace profiles due to the random sampling. b) It's not reasonable to generalize to all 18-year-old MySpace users since not all have publicly accessible profiles. c) It's not completely reasonable to generalize to all users with accessible profiles since the study focused on 18-year-olds only.

Step by step solution

01

Part (a): Reasonability of Generalization

Considering the methodology adopted for this study involved analyzing a random sample of 500 18-year-olds with accessible MySpace profiles, it can be reasonable to generalize the conclusion to all 18-year-olds. This is because randomness enhances the representativeness of the sample to the population.
02

Part (b): Scope in Relation to Accessible Profile Status

The generalization to all 18-year-old MySpace users, even those who do not have publicly accessible profiles might not be reasonable. This is because data from those with non-public profiles was not collected nor analyzed, which could influence the actual outcome if it were considered.
03

Part (c): Generalization to All Publicly Accessible Profile Users

Generalizing the conclusion to all MySpace users with publicly accessible profile regardless of their age might not be completely reasonable. This is because the age variable might play a significant role in behaviors displayed online. The study only looked at 18-year-olds, so it may not accurately represent the behaviors of users of other ages.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

The article "l'd Like to Buy a Vowel, Drivers Say" (USA Today, August 7,2001 ) speculates that young people prefer automobile names that consist of just numbers and letters and that do not form a word (such as Hyundai's \(\mathrm{XG} 300\), Mazda's \(626,\) and BMW's \(325 \mathrm{i}\) ). The article goes on to state that Hyundai had planned to identify the car that was eventually marketed as the XG300 with the name Concerto, until they determined that consumers hated it and thought that XG300 sounded more "technical" and deserving of a higher price. Do the students at your school feel the same way? Suppose that a list of all the students at your school is available. Describe how you would use the list to select a simple random sample of 150 students. (Hint: see discussion on page 14 on selecting a random sample)

For each of the statistical studies described, indicate whether the study is an observational study or an experiment. Give a brief explanation for your choice. A study to evaluate whether vitamins can help prevent recurrence of blocked arteries in patients who have had surgery to clear a blocked artery was described in the article "Vitamins Found to Help Prevent Blocked Arteries" (Associated Press, September 1, 2002). The study involved 205 patients who were assigned to one of two groups. One group received a vitamin supplement for 6 months, while the other group did not receive the vitamin supplement.

For each of the statistical studies described indicate whether the study is an observational study or an experiment. Give a brief explanation for your choice. An article in USA Today (October 19,2010 ) describes a study of how young children learn. Sixty-four 18 -month-old toddlers participated in the study. The toddlers were allowed to play in a lab equipped with toys, which also had a robot hidden behind a screen. The article states: "After allowing the infants play time, the team removed the screen and let the children see the robot. In some tests, an adult talked to the robot and played with it. In others the adult ignored the robot. After the adult left the room, the robot beeped and then turned its head to look at a toy to the side of the infant. In cases where the adult had played with the robot, the infant was four times more likely to follow the robot's gaze to the toy."

The paper "From Dr. Kildare to Grey's Anatomy" (Annals of Emergency Medicine [2010]: \(21 \mathrm{~A}-23 \mathrm{~A}\) ) describes several studies of how the way in which doctors are portrayed on television might influence public perception of doctors. One study was described as follows: Rebecca Chory, Ph.D., now an associate professor of communication at West Virginia University, began studying the effect of such portrayals on patients' attitudes toward physicians. Using a survey of 300 undergraduate students, she compared perceptions of physicians in 1992 - the end of the era when physicians were shown as all-knowing, wise father figures-with those in \(1999,\) when shows such as \(E R\) and Chicago Hope \((1994-2000)\) were continuing the transformation to showing the private side and lives of physicians, including vivid demonstrations of their weaknesses and insecurities. Dr. Chory found that, regardless of the respondents' personal experience with physicians, those who watched certain kinds of television had declining perceptions of physicians' composure and regard for others. Her results indicated that the more prime time physician shows that people watched in which physicians were the main characters, the more uncaring, cold, and unfriendly the respondents thought physicians were. a. Answer the following four questions for the observational study described in this exercise. (Hint: Reviewing Examples 1.3 and 1.4 might be helpful.) 1\. What is the population of interest? 2\. Was the sample selected in a reasonable way? 3\. Is the sample likely to be representative of the population of interest? 4\. Are there any obvious sources of bias? b. Based on the study design, do you think that the stated conclusions are reasonable?

The authors of the paper "Fudging the Numbers: Distributing Chocolate Influences Student Evaluations of an Undergraduate Course" (Teaching in Psychology [2007]: \(245-247\) ) carried out a study to see if events unrelated to an undergraduate course could affect student evaluations. Students enrolled in statistics courses taught by the same instructor participated in the study. All students attended the same lectures and one of six discussion sections that met once a week. At the end of the course, the researchers chose three of the discussion sections to be the "chocolate group." Students in these three sections were offered chocolate prior to having them fill out course evaluations. Students in the other three sections were not offered chocolate. The researchers concluded that "Overall, students offered chocolate gave more positive evaluations than students not offered chocolate." Indicate whether the study is an observational study or an experiment. Give a brief explanation for your choice.
See all solutions

Recommended explanations on Math Textbooks

Calculus

Read Explanation

Applied Mathematics

Read Explanation

Decision Maths

Read Explanation

Logic and Functions

Read Explanation

Geometry

Read Explanation

Statistics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.