Q3. A city planner wants to estimate the average monthly residential water usagein the city. He selected a random sample of 40 households from the city,which gave the mean water usage to be 3415.70 gallons over a 1-monthperiod. Based on earlier data, the population standard deviation of themonthly residential water usage in this city is 389.60 gallons. Make a 95%confidence interval for the average monthly residential water usage for allhouseholds in this city.

Given,sample size(n)=40sample mean(x¯)=3415.70standard…

Answered: Q3. A city planner wants to estimate…

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

Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard deviation 23. Find the first quartile, which is the first IQ score separating the bottom 25% from the top 75%
A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what percentage of students spend less than 12 hours in class?
The scores of adults on an IQ test are approximately Normal with mean 100 and standard deviation 15. Find the top 10% of the scores (2 decimal points) and IQ score of top 10% (1 decimal point).
A LED lamp has a mean usage of 750 hours with standard deviation of 50 hours. If LED lamp usage is normally distributed, what percentage of the distribution that lies between 600 and 900 hours ?
The IQ’s in a certain population are normally distributed with a mean score of 104and a standard deviation of 14. Find the 67th percentile of IQ’s in this population.
A sample of 37 inchworms in Cititon Park was collected and measured. Their lengths had a mean of 2.56 cm with a standard deviation of 0.09 cm. Find the 95% confidence interval for the mean length of all the inchworms in Cititon Park.
In 1988, on the math SAT, the males taking the exam averaged about 500, while the females averaged about 455. Both histograms followed the normal curve, and both standard deviations were about 100. Estimate the percentage of males in 1988 scoring over 600 Estimate the percentage of females in 1988 scoring over 600. What is the 10th percentile of the scores for the males? What is the first quartile of the scores for the females?
Avalanches can be a real problem for travelers in the western United States and Canada. Slab avalanches studied in Canada had an average thickness of µ = 67 cm. A sample of 31 avalanches in the U.S. gave a sample mean of = 63.0 cm. It is known that o = 10.3 cm for this type of data. Use a 0.03 level of significance to test the claim that the mean slab thickness of avalanches in the United States is different from that in Canada. Use the P-Value Approach. What is the Decision for this problem? O There is not sufficient evidence at the 0.03 level of significance to show that the mean slab thickness of avalanches in the United States is different from that in Canada. There is sufficient evidence at the 0.03 level of significance to show that the mean slab thickness of avalanches in the United States is less than that in Canada. There is sufficient evidence at the 0.03 level of significance to show that the mean slab thickness of avalanches in the United States is different from that in…
A random sample of 5 months in an urban area showed an average of 28 mail carriers were bitten by dogs. If the population is normal and the standard deviation of the sample is 3, find the 95% confidence interval for the population mean.
The heights of all women in the United States are known to be normally distributed with a mean of 63 inches and standard deviation of 3 inches. The U.S. Navy requires that fighter pilots have heights between 58 inches and 72 inches. Find the percentage of women in the United States that meet this height requirement. Round the solution to two decimal places, if necessary.
The mean diastolic blood pressure for a random sample of 70 people was 96 millimeters of mercury. If the standard deviation of individual blood pressure readings is known to be 11 millimeters of mercury, find a 90% confidence interval for the true meandiastolic blood pressure of all people. Then give its lower limit and upper limit.
Two engineers were asked to estimate the average life of their company's batteries. Engineer 1 set an estimate of 27.5 hours with a standard deviation of 5 hours. On the other hand, engineer 2 estimated the mean to be 31 hours with a standard deviation of 6 hours. If the population mean is 30.5 hours, what are the mean squared errors of each estimate and which should be selected by the company as the optimal? Mean Squared Error (Engineer 1): Mean Squared Error (Engineer 2): Optimal: Engineer (Answer either 1 or 2)

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