Learning Materials
Features
Discover
Chapter 4: Q AP1.12. (page 278)
A linear regression was performed using the five following 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
The correct option is (b).
Over 30 million students worldwide already upgrade their learning with Vaia!
All the tools & learning materials you need for study success - in one app.
Get started for free
High-speed Internet Laying fiber-optic cable is expensive. Cable companies want to make sure that, if they extend their lines out to less dense suburban
or rural areas, there will be sufficient demand and the work will be cost-effective. They decide to conduct a survey to determine the proportion of households in a rural subdivision that would buy the service. They select a sample of 5 blocks in the subdivision and survey each family that lives on those blocks.
(a) What is the name for this kind of sampling method?
(b) Suppose there are 65 blocks in the subdivision. Use technology or Table D to select 5 blocks to be sampled. Explain your method clearly.
What is the purpose of the control group in this experiment?
Growing in the shade Ability to grow in shade may help pines found in the dry forests of Arizona to resist drought. How well do these pines grow in shade?
Investigators planted pine seedlings in a greenhouse in either full light, lightly reduced to of normal by shade cloth, or light reduced to of normal. At
the end of the study, they dried the young trees and weighed them.
Random digits Which of the following statements are true of a table of random digits, and which are false? Briefly explain your answers.
(a) There are exactly four in each row of digits.
(b) Each pair of digits has a chance of being
(c) The digits can never appear as a group
because this pattern is not random.
Stronger players A football coach hears that a new exercise program will increase upper-body strength better than lifting weights. He is eager to test this new program in the off-season with the players on his high school team. The coach decides to let his players choose which of the two treatments they will undergo
for three weeks—exercise or weight lifting. He will use the number of push-ups a player can do at the end of the experiment as the response variable.
(a) Which principle of experimental design does the coach’s plan violate? Explain how this violation could lead to confounding.
(b) Comment on the coach’s choice of response variable.
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Exams 
GCSE 
IGCSE 
AS 
A Level 
International A Level 
University Admissions Tests 
Flashcards 
Vaia AI 
Notes 
Study Plans 
Study Sets 
Find a job 
Find a degree 
Student Deals 
Magazine 
Mobile App