1. Testing Gas Mileage Claims. Assume that you are working for the Consumer Protection Agency and...

  

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1. Testing Gas Mileage Claims. Assume that you are working for the Consumer Protection Agency and have recently been getting complaints about the highway gas mileage of the new Dodge Caravans. Chrysler Corporation agrees to allow you to randomly select 40 of its new Dodge Caravan to test the highway mileage. Chrysler claims that the Caravans get 28 mpg on the highway. Your results show a mean of 26.7 and a standard deviation of 4.2. You support Chrysler's claim. a. Show why you support Chrysler's claim by listing the P-value from your output. After more complaints, you decide to test the variability of the miles per gallon on the highway. From further questioning of Chrysler's quality control engineers, you find they are claiming a standard deviation of 2.1. b. Test the claim about the standard deviation. c. Write a short summary of your results and any necessary action that Chrysler must take to remedy customer complaints. d. State your position about the necessity to perform tests of variability along with tests of the means. 2. One-Way Airfares. The average one-way airfare from Pittsburg to Washington, D.C., is $236. A random sample of 20 one-way fares during a particular month had a mean of $210 with a standard deviation of $43. At a = 0.02, is there sufficient evidence to conclude a difference from the stated mean? Use the sample statistics to construct a 98% confidence interval for the true mean one-way airfare from Pittsburg to Washington D.C., and compare your interval to the results of the test. Do they support or contradict one another? 1. Testing Gas Mileage Claims. Assume that you are working for the Consumer Protection Agency and have recently been getting complaints about the highway gas mileage of the new Dodge Caravans. Chrysler Corporation agrees to allow you to randomly select 40 of its new Dodge Caravan to test the highway mileage. Chrysler claims that the Caravans get 28 mpg on the highway. Your results show a mean of 26.7 and a standard deviation of 4.2. You support Chrysler's claim. a. Show why you support Chrysler's claim by listing the P-value from your output. After more complaints, you decide to test the variability of the miles per gallon on the highway. From further questioning of Chrysler's quality control engineers, you find they are claiming a standard deviation of 2.1. b. Test the claim about the standard deviation. c. Write a short summary of your results and any necessary action that Chrysler must take to remedy customer complaints. d. State your position about the necessity to perform tests of variability along with tests of the means. 2. One-Way Airfares. The average one-way airfare from Pittsburg to Washington, D.C., is $236. A random sample of 20 one-way fares during a particular month had a mean of $210 with a standard deviation of $43. At a = 0.02, is there sufficient evidence to conclude a difference from the stated mean? Use the sample statistics to construct a 98% confidence interval for the true mean one-way airfare from Pittsburg to Washington D.C., and compare your interval to the results of the test. Do they support or contradict one another?

Answer rating: 100% (QA)

1 aThe Pvalue for the test of means is 0423 which is greater than 005 This means that there is not e... View the full answer