A paint manufacturer fills cans of paint using amachine that has been calibrated to fill the cansto contain an average of 1 gallon (128 ounces)each. To test whether their machine has comeout of calibration, the manufacturer takes arandom sample of 25 cans and finds that theyaverage 128.2 ounces with a standard deviationof 2.3 ounces. Which of these is the a correct97.5% confidence interval?O (127.10, 129.30)O (123.94, 132.46)O (124.48, 131.92)O(127.25, 129.15)

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Answered: A paint manufacturer fills cans of…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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A group of students sampled water from 34 lakes in St. Joseph County. If the mean dissolvedoxygen level was 3.2 with a standard deviation of .57 find a 90% confidence interval for thedissolved oxygen levels in St Joseph County lakes.
A cheese maker sells cheese in wheels that are known to have a standard deviation of 1.9ounces. If a study of 36 wheels reveals that the average weight of a wheel is 61.3 ounces find a95% confidence interval for the mean weight of a wheel of cheese.
A study is conducted to find the mean life of a certain manufacturer's car batteries. A random sample of 34 batteries is selected and a mean of 47.5 months with a standard deviation of 7.3 months is found. Find a 95% confidence interval for the mean battery life.
The head of the quality department of a battery factory needs to estimate the average lifetime of a large delivery of “double A” batteries made at the factory. The standard deviation of lifetimes is known to be 100 hours. A random sample of 64 “double A” batteries results in a sample mean lifetime of 350 hours. Construct a 95% two-sided confidence interval for the mean lifetime for the entire batteries for delivery.
A large urgent care center with 4 doctors found that they can see an average of 28 patients per hour. Assume the standard deviation is 4.2. A random sample of 41 hours was selected. Find the 99% confidence interval of the mean.
A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spent studying per week. They sampled 240 students and found a mean of 22.3 hours per week. Assuming a population standard deviation of six hours, what is the confidence interval at the 95% level of confidence?
After a sewer spill into a lake, an environmentalist wanted to test to see if the water was safe (mean bacteria count per unit volume of water is less than 200). Ten samples along different locations of the lake resulted in a sample mean of 192.7 and a sample standard deviation of 10.81. 2. a. Construct a 95% confidence interval for the mean.
Manny obtains a random sample of 72 cars and finds the average distance to be 14,362 miles with a standard deviation of 1,359 miles. Construct a 99% confidence interval for the population mean distance driven per year. A claim is made that the average distance driven is 15,000 miles. Would this claim be valid or invalid
A sample of 12 suburban hotels showed that the mean revenue is $1117. It is known that the standard deviation is $121.8. Construct the 90% confidence interval for the true average revenue of all suburban hotels.
The burning rates of two different solid-fuel propellants used in air crew escape systems are being studied. It is known that beth propellants have approximately the same standard deviation of burning rate; that is o, = 6, =3 centimeters per second. Two random samples of m, = 20 and M, = 20 specimens are tested; the sample mean burning rates are &, = 18 centimeters per second and &, = 24 centimeters per second. Use a = 0.10. Construct a 90% confidence interval on the difference in means.
The average gasoline price of one of the major oil companies has been $ 2.20 per gasoline.Because of cost reduction measure it is believed that there has been a significant reduction in the average price.in order to test this belief we randomly selected a sample of 36 of the gas station and determined that the average price for the stations in the sample was $2.14.assume that the standard deviation of the population is $0.12. a).at 95% confidence test the company 's claim.
A 95% confidence interval for the mean hours freshmen spent on social media per day was calculated to be (2.5 hours, 3.1 hours). The confidence interval was based on an SRS of size n 100. The standard deviation is given by: %3D

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