(b) 99% confidence interval for m1-m2: -2.5 to 5.5
Conclusion: H0
Significance level:
Group with the larger mean:
(c) 90% confidence interval for m1-m2: -10.8 to -3.3
Conclusion: H0
Significance level:
Group with the larger mean:
Chapter 4, Section 5, Exercise 156
Are you “In a Relationship”?
A new study1 shows that relationship status on Facebook matters to couples. The study included 58college-age heterosexual couples who had been in a relationship for an average of 19 months. In 45 of the 58 couples, both partners reported being in a relationship on Facebook. In 31 of the 58 couples, both partners showed their dating partner in their Facebook profile picture. Men were somewhat more likely to include their partner in the picture than vice versa. However, the study states: “Females’ indication that they are in a relationship was not as important to their male partners compared with how females felt about male partners indicating they are in a relationship.” Using a population of college-age heterosexual couples who have been in a relationhip for an average of 19 months:
(a) A 95% confidence interval for the proportion with both partners reporting being in a relationship on Facebook is about 0.66 to 0.88. What is the conclusion in a hypothesis test to see if the proportion is different from 0.5? What significance level is being used?
Conclusion: H0
Significance level:
(b) A 95% confidence interval for the proportion with both partners showing their dating partner in their Facebook profile picture is about 0.40 to 0.66 . What is the conclusion in a hypothesis test to see if the proportion is different from 0.5? What significance level is being used?
Conclusion: H0
Significance level:
1 Roan, Shari, “The true meaning of Facebook’s ‘in a relationship'”, Los Angeles Times, February 23, 2012, reporting on a study in Cyberpsychology, Behavior, and Social Networking.
Chapter 5, Section 1, Exercise 013
Find the specified areas for a normal density.
Warning
[removed]Don’t show me this message again for the assignment
Choose the graph for the the middle 80% for a standard normal distribution converted to a N(100,15) distribution.
[removed]
[removed]
[removed]
[removed]
[removed]
Chapter 5, Section 1, Exercise 031
Random Samples of College Degree Proportions
The distribution of sample proportions of US adults with a college degree for random samples of size n=500 is N(0.275,0.02). How often will such samples have a proportion, Ùp, that is more than 0.300?
Round your answer to one decimal place.
[removed]% of samples of 500 US adults will contain more than 30.0% with at least a bachelor’s degree.
Warning
[removed]Don’t show me this message again for the assignment
A statistics instructor designed an exam so that the grades would be roughly normally distributed with mean m=75 and standard deviation δ=11. Unfortunately, a fire alarm with ten minutes to go in the exam made it difficult for some students to finish. When the instructor graded the exams, he found they were roughly normally distributed, but the mean grade was 60 and the standard deviation was 18. To be fair, he decides to ‘‘curve” the scores to match the desired N(75,11) distribution. To do this, he standardizes the actual scores to z-scores using the N(60,18) distribution and then ‘‘unstandardizes” those z-scores to shift to N(75,11).
What is the new grade assigned for a student whose original score was 45?
Round your answer to the nearest integer.
new score=[removed]
How about a student who originally scores an 87?
Round your answer to the nearest integer.
new score[removed]
Chapter 5, Section 2, Exercise 044
Find the indicated confidence interval. Assume the standard error comes from a bootstrap distribution that is approximately normally distributed.
A 95% confidence interval for a proportion p if the sample has n=200 with Ùp=0.34, and the standard error is SE=0.03
Round your answers to three decimal places.
The 95% confidence interval is [removed]to [removed].
Chapter 5, Section 2, Exercise 046
Find the indicated confidence interval. Assume the standard error comes from a bootstrap distribution that is approximately normally distributed.
A 90% confidence interval for a mean mif the sample has n=80 with `x=22.9 and s=5.8, and the standard error is SE=0.65
Round your answers to three decimal places.
The 90% confidence interval is [removed]to [removed].
Chapter 5, Section 2, Exercise 059
Where Is the Best Seat on the Plane?
A survey of 1000 air travelers1 found that 60% prefer a window seat. The sample size is large enough to use the normal distribution, and a bootstrap distribution shows that the standard error is SE=0.015.
Use a normal distribution to find a 90% confidence interval for the proportion of air travelers who prefer a window seat.
Round your answers to three decimal places.
The 90% confidence interval is [removed]to [removed].
1Willingham, A., ‘‘And the best seat on a plane is… 6A!,” HLNtv.com, April 25, 2012.
Warning
[removed]Don’t show me this message again for the assignment
Hospital admissions for asthma in children younger than 15 years was studied1 in Scotland both before and after comprehensive smoke-free legislation was passed in March 2006. Monthly records were kept of the annualized percent change in asthma admissions, both before and after the legislation was passed. For the sample studied, before the legislation, admissions for asthma were increasing at a mean rate of 5.2% per year. The standard error for this estimate is 0.7% per year. After the legislation, admissions were decreasing at a mean rate of 18.2% per year, with a standard error for this mean of 1.79%. In both cases, the sample size is large enough to use a normal distribution.
1Mackay, D., et. al., ‘‘Smoke-free Legislation and Hospitalizations for Childhood Asthma,” The New England Journal of Medicine, September 16, 2010; 363(12):1139-45.
Warning
[removed]Don’t show me this message again for the assignment
(a) Find a 95% confidence interval for the mean annual percent rate of change in childhood asthma hospital admissions in Scotland before the smoke-free legislation.
Round your answers to one decimal place.
The 95% confidence interval is [removed]to [removed].
Warning
[removed]Don’t show me this message again for the assignment
(d) The evidence is quite compelling. Can we conclude cause and effect?
Chapter 5, Section 2, Exercise 064
Penalty Shots in World Cup Soccer
A study1 of 138 penalty shots in World Cup Finals games between 1982 and 1994 found that the goalkeeper correctly guessed the direction of the kick only 41% of the time. The article notes that this is ‘‘slightly worse than random chance.” We use these data as a sample of all World Cup penalty shots ever. Test at a 5% significance level to see whether there is evidence that the percent guessed correctly is less than 50%. The sample size is large enough to use the normal distribution. The standard error from a randomization distribution under the null hypothesis is SE=0.043.
1St.John, A., ‘‘Physics of a World Cup Penalty-Kick Shootout – 2010 World Cup Penalty Kicks,” Popular Mechanics, June 14, 2010.
Warning
[removed]Don’t show me this message again for the assignment
Reject H0 and find evidence that the proportion guessed correctly is not less than half.
[removed]
Reject H0 and find evidence that the proportion guessed correctly is less than half.
[removed]
Do not reject H0 and do not find evidence that the proportion guessed correctly is less than half.
[removed]
Do not reject H0and find evidence that the proportion guessed correctly is less than half.
Chapter 5, Section 2, Exercise 065
How Often Do You Use Cash?
In a survey1 of 1000 American adults conducted in April 2012, 43% reported having gone through an entire week without paying for anything in cash. Test to see if this sample provides evidence that the proportion of all American adults going a week without paying cash is greater than 40%. Use the fact that a randomization distribution is approximately normally distributed with a standard error of SE=0.016. Show all details of the test and use a 5% significance level.
1‘‘43% Have Gone Through a Week Without Paying Cash,” Rasmussen Reports, April 11, 2011.
Warning
[removed]Don’t show me this message again for the assignment
The writer is very fast, professional and responded to the review request fast also. Thank you.
Term paper
22/08/2022
They have a magnificent team. These people are always kind and willing to listen to your concerns or issues. Better yet, your assignment is always ready before the time, they usually send you a draft to double-check before they finalize your paper.
Article review
22/08/2022
Outstanding work! This writer followed every instruction and my paper came back with an A! I recommend to anyone needing help! Thank you again ❤️
Presentation/PPT
22/08/2022
Completed quickly and followed instructions given. Grammar, spelling, etc. was all good as well. Thank you so much! Will hire in the future.
Dissertation/Dissertation chapter
22/08/2022
Made 100% on both the outline and the paper. Quick turnaround time and my writer responded within 30 min or less. Any edits my instructor needed, my writer was patient and worked diligently to accomplish the task. Would recommend my writer to anyone!
Case study
22/08/2022
It took some time to achieve the product I was looking for, but we eventually got there. I do feel like a lot of hard work was put into this, and it even exceeded the page requirement. I'm pretty pleased overall. I give my thanks.
Article
22/08/2022
I absolutely love this writer! He/she always cranks out a fabulous paper and follows the assignment guidelines/instructions perfectly. Thanks again for always providing such quality work!!!
Journal article
22/08/2022
Outstanding job in writing my paper. I am always thrill to receive a well written paper that follows the instructions and the thorough details put into my paper. The quality of this paper is beyond awesome. Thank you so much.
Thesis/Thesis chapter
22/08/2022
My third using this writer and absolutely amazing work! Very punctual and very understanding
Research paper
22/08/2022
The work has not been graded but I like the output that was submitted to me. Is it possible for the same prof to do the next assignment I will be submitting? If possible, I will greatly appreciate it.
Term paper
23/09/2021
Thank you so so so much! you just made my day! I really appriciate all of you andn your writer's hard work and their effort and their time! you guys are truly the best! I am so happy to be working with people like you! Happy Easter! :) I hope you, your colleagues and all the writers have a wonderful rest of your day! :)
Analysis (any type)
23/09/2021
Everything was delivered on time and how I requested it. The writer finished before the due date and did a great job following directions. The writer also made sure to do full research on the topic and provided citations with references to support the essay.
Report (any type)/Brief report
23/09/2021
Thank you, so much. I greatly appreciate you doing this for me, you truly have exceeded my expectations. I am grateful for your services and I pray all is well with you and your families. God Bless you all.
Project
23/09/2021
Thank you so much! You guys are awesome. I will continue to use this service.
Term paper
23/09/2021
Thank you very much for such a great job within the timeframe. Definitely will continue using your services. Thanks to the writer who did my paper. I really appreciate your work.
Research paper
23/09/2021
Thank you, guys!!!! amazing work i know this is an A paper!!!! Thank you sooo much!!!
Article
23/09/2021
Thank you so much to this team and to the writer because the ebook that i purchase the code is still not working. you guys are the best
Article
23/09/2021
The writer assigned to my paper was phenomenal. She exceeded my expectations and provided timely communication.
Journal article
23/09/2021
Great job thank you very much. I am very happy and satisfied with your job!
Outline
23/09/2021
I really enjoyed the paper!! It's awesome. The person who wrote did a wonderful job. I appreciate them so much. I will be using this service again in the future!!
Response essay
23/09/2021
Really great job. Thank you so much. I really love it. Thank you so much for all of your help.
Essay (any type)
23/09/2021
very happy with the paper. Thank you, writer. will continue to use your sevices.
Report (any type)/Brief report
23/09/2021
I have received a high-quality paper within very short time (12 days before the deadlines). I will approve it and if I have any questions or modification i will come back to you.
Article
23/09/2021
I want to give an special thanks to the writer. You did a great job. I am very satisfied.
Research paper
23/09/2021
you guys are the sweetest! I am happy I am working with amazing people like you guys! :) hope you have an amazing rest of your day!
Essay (any type)
23/09/2021
Truly appreciate the things your company does. It truly helps people with certain deadlines and a hectic life they have.
Analysis (any type)
23/09/2021
Followed all my revisions. The writer did an awesome job. Well written and very solid quality paper. Thank you!
Outline
23/09/2021
This is absolutely what a great service means! Special thank you to the support team for being above and beyond, when it came to a very short deadline for a revision. Their cooperation was exceptional.
Literature Analysis/Review
23/09/2021
The writer did a phenomenal job with this paper! I am really happy with how the paper came out! :)
Reflection paper/Reflection essay
23/09/2021
Thank you. You did a great job. I love that you return my papers earlier than the due dates. good quality paper.
Presentation/PPT
23/09/2021
Thank you so much for writing my paper. All the details you added to the paper made the paper very informative. The organization was super great. Once again thank you.
Report (any type)/Brief report
23/09/2021
Thank you for all your excellent work you have helped me tremendously....
Essay (any type)
23/09/2021
This is amazing! Big words for my grade level but I can personally fix that. However, overall amazing.
Research proposal
23/09/2021
excellent work and the quality is amazing. I have referred this service to 3 of my co-workers.
Research paper
23/09/2021
Omg!! This is an excellent paper that you helped write for me. Thank you, so much!! I know, I'll be coming again your services with my Cost Accounting course and Accounting Finance course. :)
Essay (any type)
23/09/2021
Thank you for the cooperation and dedication. Looking forward to working in the near future.
Easy Testimonials
23/09/2021
I love your product! I would recommend this to anyone. What a great find!
Easy Testimonials
23/09/2021
I receieved excellent customer support, and quickly. Thank you so much!
Easy Testimonials
23/09/2021
I needed a simple, easy-to-use way to add testimonials to my website and display them. Easy Testimonials Pro did all of that and more!
Any citation style (APA, MLA, Chicago/Turabian, Harvard)
Our guarantees
Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.
Money-back guarantee
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.
Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.
Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.
By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.
8 years ago
