5.Assume that the sample is asimple random sample obtained fromnormala population withadistribution. We have a sample of106 body temperatures having amean of 98.20°F_and a standarddeviation of 0.62°F. Construct a95% confidence interval of thestandard deviation of the bodytemperaturespopulation.fortheentire

Answered: Image /qna-images/answer/79abc069-0ffc-4744-997d-1c075e2b40e7.jpg

Answered: Assume that the sample is a simple…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

5.) The operations manager of a large production plant would like to estimate the mean amount of time a worker takes to assemble a new electronic component. Assume that the standard deviation of this assembly time is 3.6 minutes. a. After observing 120 workers assembling similar devices, the manager noticed that their average time was 16.2 minutes. Construct a 90% confidence interval for the mean assembly time. b. How many workers should be involved in this study in order to have the mean assembly time estimated up to + 15 seconds with 90% confidence?
Many companies allow managers to accumulate extra working hours above 40 hrs/week (called comp time). Suppose a VP wants to estimate the avg amount of comp time accumulated per week for all managers in her company. The VP selects a random sample of 18 managers. If the sample reveals an average comp time of 13.56 hrs/week, with a standard deviation of 7.8 hrs, construct a 90% confidence interval to estimate the avg amount of comp time accumulated per week in the company.
a bank wishing to determine the average amount of time a customer must wait to be served took a random sample of 100 customers and found that the mean waiting time was 7.2 minutes. assuming that the population standard deviation is known to be 15 minutes, obtain the 90% confidence interval estimate of the mean waiting time for all the bank customers
The trade union of Sekhukhune University wanted to know the average wage of all workers of the university before entering intosalary negotiations for 2020. Suppose the wages of all employees are normally distributed. A random sample of 64 employees was selected and had an average of R22 700 per month with a standard deviation of R3 200 per month. Construct a 95% confidence interval for the population average and interpret the results.
Suppose that for a random sample of 200 firms that revalued their fixed assets, the mean ratio of debt to tangible assets was 0.517 and the sample standard deviation was 0.148. For an independent random sample of 400 firms that did not revalue their fixed assets, the mean ratio of debt to tangible assets was 0.489 and the sample standard deviation was 0.158. Find a 99% confidence interval for the difference between the two population means.
The treasurer of a municipality claims that the average net worth of families living in this municipality is P730,000. A random sample of 50 families selected from this area produced a mean net worth of P860,000 with standard deviation of P65,000. Using 1% significance level, can we conclude that the claim is true? Also, find the 99% confidence interval of the true mean.
The board of a major credit card company requires that the mean wait time for customers when they call customer service is at most 3.00 minutes. To make sure that the mean wait time is not exceeding the requirement, an assistant manager tracks the wait times of 43 randomly selected calls. The mean wait time was calculated to be 3.28 minutes. Assuming the population standard deviation is 0.87 minutes, is there sufficient evidence to say that the mean wait time for customers is longer than 3.003.00 minutes with a 95% level of confidence? Step 1 of 3 : State the null and alternative hypotheses for the test. Fill in the blank below. H0: μ=3.00: Ha: μ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯3.00
8. Suppose a teacher looks at a random sample of 42 final exam completion times and finds a mean timeof 111 minutes with a sample standard deviation of 44 minutes. Which value best approximates themargin of error for a 95% confidence interval?
2) Suppose that in a random sample of 50 well water samples, conducted in particular region of Nova Scotia, the average concentration of arsenic was found to be 0.013 mg/L. Suppose further that it is known from long experience that the standard deviation of arsenic concentration is 0.007 mg/L throughout Nova Scotia. Health Canada’s Maximum Acceptable Concentration for arsenic in well water is 0.01 mg/L. Test the claim that the well water is actually safe, according to Health Canada, at a 95% confidence level and report a p-value
Suppose a sample of Burger King owners who serve customers forbreakfast report their number of customers for a specific period of time. For a sampling distribution ofn = 25, the restaurants have a mean of 53 and standard deviation of 5.8Find the 90% confidence interval
Suppose an electrical firm manufactures light bulbs that have a length of life that isnormally distributed, with a standard deviation of 55 hours. If a random sample of 27 bulbs has a mean length of life of 1,320 hours, find a 99% confidence interval for the population mean length of life of all bulbs produced by this firm. Interpret this interval.
The board of a major credit card company requires that the mean wait time for customers for service calls isat most 3.00 minutes. To make sure that the mean wait time is not exceeding the requirement, anassignment manager tracks the wait times of 45 randomly selected calls. The mean wait time wascalculated to be 3.4 minutes. Assuming the population standard deviation is 1.45 minutes, is there sufficientevidence to say that the mean wait time is longer than 3.00 minutes with a 98% level of confidence?

SEE MORE QUESTIONS

Recommended textbooks for you

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

Elementary Statistics: Picturing the World (7th E…

Statistics

ISBN:

9780134683416

Author:

Ron Larson, Betsy Farber

Publisher:

PEARSON

The Basic Practice of Statistics

Statistics

ISBN:

9781319042578

Author:

David S. Moore, William I. Notz, Michael A. Fligner

Publisher:

W. H. Freeman

Introduction to the Practice of Statistics

Statistics

ISBN:

9781319013387

Author:

David S. Moore, George P. McCabe, Bruce A. Craig

Publisher:

W. H. Freeman

SEE MORE TEXTBOOKS