2. The fuel economy sticker on a new SUV's window sticker indicates the ownercan expect 16 mpg in city driving, 20 mpg highway driving and 18 mpg overall.Accurate gasoline records for one such vehicle were kept, and a random sampleof mileage per tank for 50 fill-ups of gasoline was collected:17.6 17.7 18.1 22.0 17.0 19.4 18.9 17.4 21.0 19.218.3 19.1 20.7 16.7 19.4 18.2 18.4 17.1 17.4 15.817.9 18.0 16.3 17.5 17.3 20.4 19.1 21.0 18.1 19.019.6 18.9 16.8 18.2 17.6 19.1 18.0 16.8 20.9 17.917.7 20.3 18.6 19.0 16.5 19.4 18.6 18.6 17.3 18.7a.b.Calculate the sample mean and standard deviation for this data.Round your answers to three decimal places.C.Can we consider the data to be normally distributed? Explain.d.Calculate a 99% confidence interval for this data set.Interpret your interval in the context of the problem.

From given data we have : X 17.6 17.7 18.1 22 17 19.4 18.9 17.4 21 19.2…

Answered: The fuel economy sticker on a new SUV's…

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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A local college cafeteria has a self-service soft ice cream machine. The cafeteria provides bowls that can hold up to 16 ounces of ice cream. The food service manager is interested in comparing the average amount of ice cream dispensed by male students to the average amount dispensed by female students. A measurement device was placed on the ice cream machine to determine the amounts dispensed. Random samples of 85 male and 78 female students who got ice cream were selected. The sample averages were 7.23 and 6.49 ounces for the male and female students, respectively. Assume that the population standard deviations are 1.22 and 1.17 ounces, respectively. Using the 1% significance level, can you conclude that the average amount of ice cream dispensed by male college students is larger than the average amount dispensed by female college students? What is the type of test to be used?
The following data are collected from pregnant women to compare the Plasma ascorbic acid level of smokers and non-smokers. Table: Plasma ascorbic acid values Non-smokers 0.97, 0.72, 1.00, 0.81, 0.62, 1.32, 1.14, 1.22, 0.90, 0.74, 0.88, 0.94 Smokers 0.88, 0.71, 0.98, 0.79, 1.01, 1.16, 0.78, 1.28 Test whether there is any difference between plasma ascorbic acid levels of smokers and non-smokers. Also find 95% confidence interval for the difference of two means. Describe your findings. Use alpha=0.05 [Hint: use hypothesis, test statistics confidence interval etc.]
According to Pew Research Center surveys, 79% of U.S. adults were using the Internet in January 2011 and 83% were using it in January 2012 (USA TODAY, January 26, 2012). Suppose that these percentages are based on random samples of 1720 U.S. adults in January 2011 and 1970 in January 2012. a. Let p, and p, be the proportions of all U.S. adults who were using the Internet in January 2011 and January 2012, respectively. Construct a 95% confidence interval for p, - P2- Round your answers to three decimal places. to i
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I need help on # 3, and 4 please
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The fuel economy sticker on a new SUV's window sticker indicates the owner can expect 16 mpg in city driving, 20 mpg highway driving and 18 mpg overall. Accurate gasoline records for one such vehicle were kept, and a random sample of mileage per tank for 50 fill-ups of gasoline was collected: