/*! 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} Q R4.2. Bad sampling A large high school... [FREE SOLUTION] | 91影视

91影视

Bad sampling A large high school wants to gather student opinion about parking for students on campus. It isn鈥檛 practical to contact all students.

(a) Give an example of a way to choose a voluntary response sample of students. Explain how this

method could lead to bias.

(b) Give an example of a way to choose a convenience sample of students. Explain how this method could lead to bias.

Short Answer

Expert verified

Part (a) Because only individuals who are passionate about a subject respond to voluntary surveys, the results are likely to be skewed.

Part (b) This would lead to bias because the first 50 students will most likely have quite different attitudes on parking on campus than the other students who were unable to find a parking spot.

Step by step solution

01

Part (a) Step 1: Given information

A large student group wants to hear from students regarding parking on campus.

02

Part (a) Step 2: Concept

The random assignment method assigns subjects to treatments based on chance. Before the treatments are applied, random assignment establishes treatment groups that are comparable (except for chance variance). In experiments, randomization and comparison combined prevent bias or systematic favoritism.

03

Part (a) Step 3: Explanation

It is stated in the inquiry that a significant student wishes to obtain student feedback on campus parking. Furthermore, contacting all pupils is impractical. As an example, using the daily announcements for volunteers to come in at lunch to take the survey is one technique to select a voluntary response sample of students. As a result, because volunteer surveys are typically filled out by people who are passionate about a topic, the results are likely to be skewed.

04

Part (b) Step 1: Explanation

It is stated in the inquiry that a significant student wishes to obtain student feedback on campus parking. Furthermore, contacting all pupils is impractical. As an example of how to select a convenient sample of students, we could select the first 50 students who arrive at the camp parking lot each day. As a result, there will be prejudice because the first 50 students will likely have many different ideas regarding parking on campus than the remaining students who were unable to secure a parking spot.

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

What kind of error? Which of the following are sources of sampling error and which are sources of non-sampling error? Explain your answers.

(a) The subject lies about past drug use.

(b) A typing error is made in recording the data.

(c) Data are gathered by asking people to mail in a coupon printed in a newspaper.

Does eating dinner with their families improve students鈥 academic performance? According to an ABC News article, 鈥淭eenagers who eat with their families at least five times a week are more likely to get better grades in

school.鈥19 This finding was based on a sample survey conducted by

researchers at Columbia University.

What are the explanatory and response variables?

Students as customers A high school student the newspaper plans to survey local businesses about the importance of students as customers. From telephone book listings, the newspaper staff chooses 150 businesses

at random. Of these, 73 return the questionnaire mailed by the staff. Identify the population and the sample.

Online polls In June 2008, Parade magazine posed the following question: 鈥淪hould drivers be banned from using all cell phones?鈥 Readers were encouraged to vote online at parade.com. The July13,2008 issue of Parade reported the results: 2407(85%) said 鈥淵es鈥 and 410(15%) said 鈥淣o.鈥

(a) What type of sample did the Parade survey obtain?

(b) Explain why this sampling method is biased. Is 85% probably higher or lower than the true percent of all adults who believe that cell phone use while

driving should be banned? Why?

Chocolate and happy babies A University of Helsinki (Finland) study wanted to determine if chocolate consumption during pregnancy had an effect on infant temperament at age of 6 months. Researchers began by asking 305 healthy pregnant women to report their chocolate consumption. Six months after birth, the researchers asked mothers to rate their infants鈥 temperament, including smiling, laughter, and fear. The babies born to women who had been eating chocolate daily during pregnancy were found to be more active and 鈥減ositively reactive鈥濃攁 measure that the investigators said encompasses traits like smiling and laughter.

(a) Was this an observational study or an experiment? Justify your answer.

(b) What are the explanatory and response variables?

(c) Does this study show that eating chocolate regularly during pregnancy helps produce infants with a good temperament? Explain.

See all solutions

Recommended explanations on Math Textbooks

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.