An experiment compared fuel economies for two types of similarly equipped diesel mini-trucks. Let ussuppose that 12 Volkswagen and 10 Toyota trucks are used in 90-kilometer per hour steady-speedtests. If the 12 Volkswagen trucks average 16 kilometers per liter with a standard deviation of 1.0kilometers per liter and the 10 Toyota trucks average 11 kilometers per liter with a standard deviationofof 0.8 kilometer per liter, construct a 98% confidence interval forwhere o and o, are,respectively, the variances for the distances obtained per liter of fuel by the Volkswagen and Toyotamini-trucks. Finally, provide the numerical value of the Lower Confidence Limit (LCL). Round your finalanswer to 4 decimal places.Assume that the distances per liter for each truck model are approximately Normally distributed.

Given that, The degrees of freedoms are, Critical values: Using the F-table, the critical value at…

Answered: An experiment compared fuel economies…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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In a study to compare two different corrosion inhibitors, specimens of stainless steel were immersed for four hours in a solution containing sulfuric acid and a corrosion inhibitor. Forty-seven specimens in the presence of inhibitor A had a mean weight loss of 242 mg and a standard deviation of 20 mg, and 42 specimens in the presence of inhibitor B had a mean weight loss of 220 mg and a standard deviation of 31 mg. Find a 95% confidence interval for the difference in mean weight loss between the two inhibitors.
A U.S. Food Survey showed that Americans routinely eat beef in their diet. Suppose that in a study of 49 consumers in Illinois and 64 consumers in Texas the following results were obtained from two samples regarding average yearly beef consumption: Illinois Texas = 49 = 64 = 54.1lb = 60.4lb S1 = 7.0 S2 = 8.0 Develop a 95% confidence Interval Estimate for the difference between the two population means.
Tensile strength tests were carried out on two different grades of wire rod resulting in the accompanying data: Grade Sample Size Sample Mean (kg/mm2) Sample Standard Deviation 1064 31 108 1.3 1078 31 124 1.6 Estimate the difference between true average strengths for the two grades with a 95% confidence interval for the previous problem. Group of answer choices (-16.352, -15.648) (-16.607, -15.393) (-16.952, -15.048) (-16.741, -15.260)
1) A Gallup poll of 1015 randomly selected adults found that 69% would oppose a law that limited the size of soft drinks and other sugary beverages served in restaurants. Calculate and interpret a 95% confidence interval for the proportion of all adults that would oppose a law limiting the size of soft drinks.
A manufacturer of compact disks players uses a set of comprehensive tests to access the electrical components of one of its products. All compact disks must pass tests prior to being sold. A random sample of 500 disks players resulted in 485 failing in one or more tests. Find a 90% confidence interval for the proportion of compact disk players from thepopulation that pass all tests.
From a simple random sample of 400 of the 1,395 colleges in our population, it was found that business statistics was a two-semester course in 141 of the sampled colleges. Estimate the proportion of all colleges for which the course is two semesters long, and find a 90% confidence interval.
A random sample of 62 suspension helmets used by motorcycle riders and automobile race-car drivers was subjected to an impact test, and on 37 of these helmets some damage was observed. Find a 90% two-sided confidence interval on the true proportion (p) of helmets of this type that would show damage from this test. 0.517 <= p <= 0.677 0.597 <= p <= 0.677 0.517 <= p <= 0.699 0.494 <= p <= 0.699 0.494 <= p <= 0.677
in a study of 150 randomly selevted accidents that required treatment in and ER 36% involed children under 6 years of age. find the 90% confidence interval of the true proportion of accidents that involve children under age 6
Bulletproof Vests. In the article “A Common Police Vest Fails the Bulletproof Test,” E. Lichtblau reported on a U.S. Department of Justice study of 103 bulletproof vests containing a fiber known as Zylon. In ballistics tests, only 4 of these vests produced acceptable safety outcomes (and resulted in immediate changes in federal safety guidelines). Find a 95% confidence interval for the proportion of all such vests that would produce acceptable safety outcomes by using the a. one-proportion z-interval procedure. b. one-proportion plus-four z-interval procedure. (See page 556 for the details of this procedure.) c. Explain the large discrepancy between the two methods. d. Which confidence interval would you use? Explain your answer.
During a routine check of the fluoride content of Gotham City's water supply, the given results were obtained from replicate analyses of a single sample: 0.513 mg/L0.513 mg/L , 0.487 mg/L0.487 mg/L , 0.511 mg/L0.511 mg/L , 0.489 mg/L0.489 mg/L , and 0.519 mg/L0.519 mg/L . Determine the mean and 90% confidence interval for the average fluoride concentration in this sample. Report the mean and the confidence interval with three significant figures.
Suppose that a safety group surveyed 1,100 drivers. Among those surveyed, 65% said that careless or aggressive driving was the biggest threat on the road, and 25% said that cell phone usage by other drivers was the driving behavior that annoyed them the most. Based on these data and assuming that the sample was a simple random sample, construct and interpret a 95% confidence interval estimate for the true proportion in the population of all drivers who are annoyed by cell phone users. The confidence interval estimate is ??––––––??> (Round to three decimal places as needed. Use ascending order.) Interpret the confidence interval estimate. A. There is a 0.95 probability that the population proportion of drivers who are annoyed by cell phone users is in the interval. B. There is 95% confidence that the population proportion of drivers who are annoyed by cell phone users is in the interval. C. There is 95% confidence that the population proportion…
A research group studying cell phone habits asked the question “Do you ever use your cell phone to make a payment at a convenience store?” to people selected from two random samples of cell phone users. One sample consisted of older adults, ages 35 years and older, and the other sample consisted of younger adults, ages 18 years to 34 years. The proportion of people who answered yes in each sample was used to create a 95 percent confidence interval of (0.097,0.125)(0.097,0.125) to estimate the difference (younger minus older) between the population proportions of people who would answer yes to the question. Which of the following is the best description of what is meant by 95 percent confidence? In repeated random sampling with the same sample size, approximately 95% of the sample proportions from the younger group will be between 0.097 and 0.125 greater than the sample proportion from the older group. A In repeated random sampling with the same sample size,…

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