Learning Materials
Features
Discover
Chapter 4: Q. 1.12 (page 294)
A linear regression was performed using the following five data points: The residual for which of the five points has The largest absolute value?
a. A
b. B
c. C
d. D
e. E
point has the largest absolute value.
Over 30 million students worldwide already upgrade their learning with 91影视!
All the tools & learning materials you need for study success - in one app.
Get started for free
Online polls 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
subsequent issue of Parade reported the results:said 鈥淵es鈥� and
said 鈥淣o.鈥�
a. What type of sample did the Parade survey obtain?
b. Explain why this sampling method is biased. Is probably greater than or less than
the true percent of all adults who believe that all cell phone use while driving should be
banned? Why?
A simple random sample of 1200 adult Americans is selected, and each person is asked
the following question: 鈥淚n light of the huge national deficit, should the government at this
time spend additional money to send humans to Mars?鈥� Only 39% of those responding
answered 鈥淵es.鈥� This survey
a. is reasonably accurate because it used a large simple random sample.
b. needs to be larger because only about 24 people were drawn from each state.
c. probably understates the percent of people who favor sending humans to Mars.
d. is very inaccurate but neither understates nor overstates the percent of people who favor
sending humans to Mars. Because simple random sampling was used, it is unbiased.
e. probably overstates the percent of people who favor sending humans to Mars.
Can a vegetarian or low-salt diet reduce blood pressure? Men with high blood pressure are
assigned at random to one of four diets: (1) normal diet with unrestricted salt; (2)
vegetarian with unrestricted salt; (3) normal with restricted salt; and (4) vegetarian with
restricted salt. This experiment has
A popular website places opinion poll questions next to many of its news stories. Simply
click your response to join the sample. One of the questions was 鈥淒o you plan to diet this
year?鈥� More than 30,000 people responded, with 68% saying 鈥淵es.鈥� Which of the
following is true?
a. About 68% of Americans planned to diet.
b. The poll used a convenience sample, so the results tell us little about the population of
all adults.
c. The poll uses voluntary response, so the results tell us little about the population of all
adults.
d. The sample is too small to draw any conclusion.
e. None of these.
Online reviews Many websites include customer reviews of products, restaurants, hotels,
and so on. The manager of a hotel was upset to see that of reviewers on a travel
website gave the hotel 鈥�star鈥濃�攖he lowest possible rating. Explain how bias in the
sampling method could affect the estimate.
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Flashcards 
91影视 AI 
Notes 
Study Plans 
Study Sets 
Find a degree 
Magazine