WebAssign is not supported for this browser version. Some features or content might not work. System requirements

WebAssign

Welcome, demo@demo

(sign out)

Sunday, May 4, 2025 09:52 EDT

Home My Assignments Grades Communication Calendar My eBooks

Moore & Notz - Stats: Concepts & Controversies 9/e (Homework)

James Finch

Statistics, section 2, Fall 2019

Instructor: Dr. Friendly

Current Score : 9 / 16

Due : Sunday, January 27, 2030 23:30 EST

Last Saved : n/a Saving...  ()

Ask Your Teacher Extension Requests Print Assignment
Question
Points
1 2 3 4
4/4 5/8 –/3 0/1
Total
9/16 (56.3%)

  • Instructions

    Statistics: Concepts and Controversies, 9th Edition, written by Moore and Notz and published by W.H. Freeman, introduces liberal arts majors to statistical ideas and shows them how to use those ideas to think about the statistical claims they see every day from polls, campaigns, advertising, public policy, and many different fields of study. The ultimate goal is to equip students with solid statistical reasoning skills that will help them understand the impact of statistics on all aspects of our lives. The new edition offers SCC’s signature combination of engaging cases, real-life examples and exercises, helpful pedagogy, rich full-color design, and innovative media learning tools, all significantly updated. The WebAssign component for this title engages students with many resources and links to a complete eBook.

    Question 1 allows the student to explore results of a double-blind experiment.

    Question 2 steps the student through a breakdown of the components of an experiment.

    Question 3 contains two explanatory variables and makes use of WebAssign's multiple select grading.

    Question 4 exposes the student to the design of a matched pairs experiment. This demo assignment allows many submissions and allows you to try another version of the same question for practice wherever the problem has randomized values.

    The answer key and solutions will display after the first submission for demonstration purposes. Instructors can configure these to display after the due date or after a specified number of submissions.

Assignment Submission

For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring

Your last submission is used for your score.

1. 4/4 points  |  Previous Answers My Notes
Question Part
Points
Submissions Used
1 2 3 4
1/1 1/1 1/1 1/1
1/100 1/100 1/100 1/100
Total
4/4
 
A Washington Post article reported a study comparing the effectiveness of three common painkillers for children. Seven hundred fifty children, aged 6 to 17, were randomly assigned to three groups. Group A received a standard dose of ibuprofen. Group B received a standard dose of acetaminophen. Group C received a standard dose of codeine. The youngsters rated their pain on a 100-point scale before and after taking the medicine.
(a)
Outline the design of this experiment. You do not need to do the randomization that your design requires.

Correct: Your answer is correct.
(b)
You read that "the children and physicians were blinded" during the study. What does this mean?
     Correct: Your answer is correct.
(c)
You also read that there was a significantly greater decrease in pain ratings for Group A than for Groups B and C, but there was no significant difference in the decrease of pain ratings for Groups B and C. What does this mean?
     Correct: Your answer is correct.
What does this finding lead you to conclude about the use of ibuprofen as a painkiller?
     Correct: Your answer is correct.


Solution or Explanation
(a)
See the diagram below.
WebAssign Plot
(b)
No one involved in administering the treatments or assessing their effectiveness knew which subjects were in each group. Additionally, the children did not know which group they were in.
(c)
The decrease in pain scores for Group A was so much greater than the decrease in scores for Groups B and C that the difference would rarely happen by chance unless ibuprofen was more effective than acetaminophen and codeine. However the difference between Groups B and C could be due to chance. Ibuprofen is the most effective painkiller of the three.
Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
2. 5/8 points  |  Previous Answers My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6 7 8
1/1 1/1 0/1 0/1 1/1 1/1 1/1 –/1
1/100 2/100 1/100 1/100 1/100 1/100 1/100 0/100
Total
5/8
 
The theory of atherosclerosis (hardening and narrowing of the arteries) emphasizes the role of inflammation in the vascular walls. Because ibuprofen is known to possess a wide range of anti-inflammatory actions, it was hypothesized that it might help in the prevention of atherosclerotic lesion development. Both a low-cholesterol and a high-cholesterol diet were used, as the extent of atherosclerosis is also affected by diet. Thirty-two New Zealand rabbits served as subjects in the experiment and, after three months, the percentage of the surface covered by atherosclerotic plaques in a region of the aorta was evaluated. Although ibuprofen did suppress the expression of a gene thought to be related to atherosclerosis, it was not shown to have an effect on the extent of fat-induced atherosclerotic lesions.
(a)
What are the individuals in this experiment?
     Correct: Your answer is correct.
What is the response variable in this experiment?
     Correct: Your answer is correct.
(b)
How many explanatory variables are there?
Incorrect: Your answer is incorrect. seenKey

2

 explanatory variables
How many treatments are there?
Incorrect: Your answer is incorrect. seenKey

4

 treatments
Use a diagram like the one below to describe the treatments.
Fill out the diagram.
Low-cholesterol diet Correct: Your answer is correct. seenKey

High-cholesterol diet
Ibuprofen Correct: Your answer is correct. seenKey

Treatment 1

 		Treatment 2
Correct: Your answer is correct. seenKey

Placebo

 		Treatment 3 Treatment 4
(c)
Use a diagram to describe a completely randomized design for this experiment. (Don't actually do the randomization.)

Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
3. –/3 points My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/100 0/100 0/100
Total
–/3
 
Is the time between when you go to bed and when you first wake up affected by the time you eat dinner and how much exercise you do during the day? Describe briefly the design of an experiment with two explanatory variables to investigate this question. Be sure to specify the treatments exactly and to tell how you will handle lurking variables such as amount of sleep the previous night.
Identify the two explanatory variables. (Select all that apply.)

Describe the design of the experiment.
    
How will you handle lurking variables?
    
Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
4. 0/1 points  |  Previous Answers My Notes
Question Part
Points
Submissions Used
1
0/1
1/100
Total
0/1
 
Do consumers prefer the taste of a latte from Dunkin' Donuts or from Starbucks in a blind test in which neither latte is identified? Describe briefly the design of a matched pairs experiment to investigate this question.
     Incorrect: Your answer is incorrect.


Solution or Explanation
The researcher will have each consumer drink the latte from both Dunkin' Donuts and Starbucks, randomizing the order for each consumer. The overall percentage that prefer the taste of each latte (Starbucks vs. Dunkin' Donuts) will be analyzed.
Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
Home My Assignments Extension Request
Enter an exact number.
Enter an exact number.