A sample of 50 days showed that afast-food restaurant served anaverage of 182 customers duringlunch (11:00 AM - 2:00PM). Thestandard deviation of thepopulation is 8. Find the 95%confidence interval for the mean.O a. 178.78-184.22O b. 179 – 185O c. 178 - 186

Z value for 95% ci is calculated from z table

Answered: A sample of 50 days showed that a…

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

A researcher is interested in finding a 95% confidence interval for the mean number Minutes students are concentrating on their professor during a one hour statistic lecture. The study included 133 students who averaged 36.2 minutes concentrating on their professor during the hour lecture. The standard deviation was 12.1 minutes. Round answers to 3 decimal places where possible.
A study of 81 bolts of carpet showed that their average length was 77.5 yards. The standard deviation of the population is 1.6 yards. Which of the following is the 95% confidence interval for the mean length per bolt of carpet?
A toy manufacturer wants to know how many new toys children buy each year. A sample of 242 children was taken to study their purchasing habits. Construct the 80% confidence interval for the mean number of toys purchased each year if the sample mean was found to be 8.7. Assume that the population standard deviation is 1.7 Round your answers to one decimal place.
A random sample of 30 words from Jane Austen's Pride and Prejudice had a mean length of 4.08 letters with a standard deviation of 2.40. A random sample of 30 words from Henry James's What Maisie Knew had a mean length of 3.85 letters with a standard deviation of 2.26. Which of the following is a correct expression for the 99% confidence interval for the difference in mean word length for these two novels? 2.40, 2.26 2.40, 2.26 (a) (4.08– 3.85)±2.756| (b) (4.08 – 3.85) ±2.045 30 30 30 30 2.402 2.26? |2.40? 2.26? (c) (4.08 – 3.85)± 2.045| 30 (d) (4.08 – 3.85)±2.045 30 30 30 |2.40² + 30 2.262 (e) (4.08 – 3.85)±2.756| 30
Find the 90% confidence interval for the standard deviation of the lengths of pipes if a sample of 22 pipes has a standard deviation of 10.6 inches.
In a random sample of 10 cell phones, the mean full retail price was $523.30 and the standard deviation was $187.00. Further research suggests that the population mean is $429.81. Does the t-value for the original sample fall between - to 95 and to 95? Assume that the population of full retail prices for cell phones is normally distributed. The t-value of t = fall between - to.95 and to.95 because to.95 =: (Round to two decimal places as needed.)
A fitness center is interested in finding a 95% confidence interval for the mean number of days per week that Americans who are members of a fitness club go to their fitness center. Records of 219 members were looked at and their mean number of visits per week was 3.5 and the standard deviation was 1.6. Round answers to 3 decimal places where possible. With 95% confidence the population mean number of visits per week is between ___ and ___visits. If many groups of 219 randomly selected members are studied, then a different confidence interval would be produced from each group. About ___percent of these confidence intervals will contain the true population mean number of visits per week and about ____ percent will not contain the true population mean number of visits per week.
The speed of greyhounds is normally distributed with a standard deviation of 0.15 mph. How many dogs do we need in our sample to estimate the mean speed of all greyhounds to within 0.05 mph for a 95% confidence interval? 35 greyhounds 87 greyhounds 61 greyhounds 42 greyhounds
From a sample of 38graduate students, the mean number of months of work experience prior to entering an MBA program was 34.93. The national standard deviation is known to be 18 months. What is a 95% confidence interval for the population mean? 95% confidence interval for the population mean is _____ , _____. (Use ascending order. Round to two decimal places as needed.)
A researcher is interested in finding a 98% confidence interval for the mean number of times per day that college students text. The study included 149 students who averaged 37.1 texts per day. The standard deviation was 13.4 texts.
In a random sample of 6 cell phones, the mean full retail price was $547.30 and the standard deviation was $176.00. Further research suggests that the population mean is $428.25. Does the t-value for the original sample fall between and to.95? Assume that the population of full retail prices for cell phones is normally distributed. - to.95 The t-value of t = fall between -1 -to.95 and to. .95 because to 95 = (Round to two decimal places as needed.)
A sample of 22 public high school students spent an average of 7 hours studying per week. Assuming the distribution of hours spent studying is normally distributed. Find a 95% confidence interval for the mean number of hours spent studying by public high school students.? Assume the standard deviation is 1.3 hours.

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

A sample of 50 days showed that a fast-food restaurant served an average of 182 customers during lunch (11:00 AM - 2:00PM). The standard deviation of the population is 8. Find the 95% confidence interval for the mean. O a. 178.78-184.22 O b. 179 - 185 O c. 178 - 186