Login

Contact Us
Homework
Homework Questions? Ask a Tutor for Answers ASAP
Not a Homework Question?
How JustAnswer Works:
Ask an Expert
Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
Get a Professional Answer
Via email, text message, or notification as you wait on our site.
Ask follow up questions if you need to.
100% Satisfaction Guarantee
Rate the answer you receive.
Ask Scott Your Own Question
Scott
,
MIT Graduate
Category:
Homework
Satisfied Customers:
3040
Experience:
MIT Graduate (Math, Programming, Science, and Music)
3546829
Type Your Homework Question Here...
Scott is online now
following data values are a simple random sample from a population
Customer Question
following data values are a simple random sample from a population that is normally distributed, with ssquared=25.0: 47, 43, 33, 42, 34, and 41. Construct and interpret the 95% and 99% confidence intervals for the population mean.
2. For df=25, determine the value of A that corresponds to each of the following probabilities.
a. P(T=A) = 0.025
b. P(T=A) =0.10
c. P(A = t =A) = 0.99
3. Given the following observations in a simple random sample from a population that is approximately normally distributed, construct and interpret the 90% and 95% confidence intervals for the mean:
67, 79, 71, 98 74, 70 59, 102, 92, 96
4. A consumer magazine has contacted a simple random sample of 33 owners of a certain model of automobile and asked each owner how many defects had to be corrected within the first two months of ownership. The average number of defects was 3.7 with a standard deviation of 1.8 defects.
a. Use the t distribution to construct a 95% confidence interval for µ= the average number of defects for this model.
b. Use the z distribution to construct a 95% confidence interval for µ= the average number of defects for this model
c. given the population standard deviation is not known, which of these two confidence intervals should be used as the interval estimate for µ?
5. An airline has surveyed a simple random sample of air travelers to find out whether they would be interested in paying a higher fare in order to have access to email during their flight. Of the 400 travelers surveyed, 80 said email access would be worth a slight extra cost. Construct a 95% confidence interval for the population proportion of air travelers who are in favor of the airlines email idea.
6. Based on its 1999 survey, student monitor reports that 20% of US college students used the internet for job hunting during the month preceding the survey. Assuming this finding to be based on a simple random sample of 1600 college students, construct and interpret the 90% confidence interval for the population proportion of college students who used the internet for job hunting during this period.
7. A consumer agency has retained an independent testing firm to examine a television manufacturer’s claim that its 25inch console model consumes just 110 watts of electricity. Based on a preliminary study, the population standard deviation has been estimated as 11.2 watts for these sets. In undertaking a larger study, and using a simple random sample, how many sets must be tested for this firm to be 95% confident that its sample mean does not differ from the actual population mean by more than 3.0 watts?
8. For each of the following pairs of null and alternative hypotheses, determine whether the pair would be appropriate for a hypothesis test. If a pair is deemed inappropriate, explain why.
a. Ho: µ= 10, H1: µ< 10
b. Ho: µ=30, H1: µ? 30
c. Ho: µ> 90, H1: µ= 90
d. Ho: µ= 75, H1 H1 µ= 85
e. Ho: Xbar = 15, H1: Xbar < 15
f. Ho: Xbar = 58, H1: Xbar ? 58
9. For each of following statements, formulate appropriate null and alternative hypotheses. Indicate whether the appropriate test will be one tail or two tail, then sketch a diagram that shows the approximate location of the “rejection region(s) for the test.
a. The average college student spends no more than $300 per semester at the unicersity bookstore.
b. The average adult drinks 1.5 cups of coffee per day
c. The average SAT score for entering freshmen is at least 1200.
d. The average employee put in 3.5 hours of overtime last week
10. For Each of the following tests and z values, determine the pvalue for the test.
a. Left tail test and z= 1.62
b. right tail test and z= 1.43
c. two tail test and z= 1.27
11. For a sample of 12 items from a normally distributed population for which the standard deviation is s= 17.0, the sample mean is 230.8. At the 0.05 level of significance, test Ho: µ= 220 versus H1: µ> 220. Determine and interpret the pvalue for the test.
12. The Coffee Association has reported the mean daily coffee consumption for U.S residents as 1.65 cups. Assume that a sample of 38 people from a North Carolina city consumed a mean of 1.84 cups of coffee per day, with a standard deviation of 0.85 cups. In a two tail test at the 0.05 level, could the residents of this city be said to be significantly different from there counterparts across the nation?
13. During 2002, college work study students earned a mean of $1252. Assume that a sample consisting of 45 of the work study students at a large university was found to have earned a mean of $1277 during that year, with a standard deviation of $210. Would a one tail test at the 0.05 level suggest the average earnings of this university’s work study students were significantly higher than the national team?
14. For a simple random sample, n=700 and p= 0.6. At the 0.025 level, test Ho: p = 0.60 versus H1: p > 0.60
15. The director of admissions at a large university says that 15% of high school juniors to whom she sends university literature eventually applies for admission. In a sample of 300 persons to whom material were sent, 30 students applied for admission. In a two tail test at the 0.05 level of significance, should we reject the director’s claim?
Submitted:
5 years ago.
Category:
Homework
Share this conversation
JustAnswer in the News:
Askadoc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses workfromhome jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
What Customers are Saying:
Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.
Mary C.
Freshfield, Liverpool, UK
<
Last

Next
>
Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.
Mary C.
Freshfield, Liverpool, UK
This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!
Alex
Los Angeles, CA
Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.
GP
Hesperia, CA
I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.
Justin
Kernersville, NC
Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.
Esther
Woodstock, NY
Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.
Robin
Elkton, Maryland
He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.
Diane
Dallas, TX
Meet The Experts:
Manal Elkhoshkhany
Tutor
Satisfied Customers:
4524
More than 5000 online tutoring sessions.
<
Last

Next
>
http://ww2.justanswer.com/uploads/BU/BusinessTutor/201222_115741_Kouki2.64x64.jpg
Manal Elkhoshkhany's Avatar
Manal Elkhoshkhany
Tutor
Satisfied Customers:
4524
More than 5000 online tutoring sessions.
http://ww2.justanswer.com/uploads/ComputersGuru/20100213_051118_Photo41.JPG
LogicPro's Avatar
LogicPro
Engineer
Satisfied Customers:
3748
Expert in Java C++ C C# VB Javascript Design SQL HTML
http://ww2.justanswer.com/uploads/LI/lindaus/2012610_04811_IMG20120609164157.64x64.jpg
Linda_us's Avatar
Linda_us
Finance, Accounts & Homework Tutor
Satisfied Customers:
3125
Post Graduate Diploma in Management (MBA)
http://ww2.justanswer.com/uploads/chooser77/20090818_162025_Chris.jpg
Chris M.'s Avatar
Chris M.
M.S.W. Social Work
Satisfied Customers:
2414
Master's Degree, strong math and writing skills, experience in oneonone tutoring (college English)
http://ww2.justanswer.com/uploads/JawaadAhmed/2009627_12137_SIs_SHadi.jpg
F. Naz's Avatar
F. Naz
Chartered Accountant
Satisfied Customers:
1998
Experience with chartered accountancy
http://ww2.justanswer.com/uploads/JK/jkcpa/2011116_182614_jkcpa.64x64.jpg
Bizhelp's Avatar
Bizhelp
CPA
Satisfied Customers:
1878
Bachelors Degree and CPA with Accounting work experience
http://ww2.justanswer.com/uploads/avremote/photoa.jpg
Seanna's Avatar
Seanna
Tutor
Satisfied Customers:
1781
3,000+ satisfied customers, all topics, A+ work
Related Homework Questions
Question
Date Submitted
I need more programming help
1/30/2015
1/31/2015
ATLProg
I have a individual project on java project files. I got the
1/29/2015
1/29/2015
LogicPro
For "The Doctor" need help with TSQL and PLSQL exercise.
1/29/2015
1/29/2015
TheDoctor
I need to create a Flowchart for a C program for Yearly Net
1/29/2015
1/31/2015
LogicPro
In C++
1/28/2015
1/29/2015
LogicPro
What are the possible implications for a dog or cat not being
1/28/2015
1/31/2015
Lani S.
For LogicPro only, C++ , Visual Studio, I will attach requirement
1/28/2015
1/28/2015
LogicPro
I need to write a java program that randomly generates an encrypted
1/28/2015
1/28/2015
ATLProg
Modify the Inventory Program to use a GUI. The GUI should
1/27/2015
1/29/2015
LogicPro
My question if for a project i am working on with my daughter
1/27/2015
1/27/2015
barristerinky
Chat Now With A Tutor
Scott
MIT Graduate
3040 Satisfied Customers
MIT Graduate (Math, Programming, Science, and Music)
X
Ask a Tutor
Get a Professional Answer. 100% Satisfaction Guaranteed.
32 Tutors are Online Now
Type Your Homework Question Here...
characters left: