HelpSubmitSave & ExitThe mean weight of trucks traveling on a particular section of I-475 is not known. A state highway inspector needs to estimate the populationmean. He selects and weighs a random sample of 49 trucks. The mean weight of the 49 trucks was 15.8 tons. Assume for purposes of thisproblem that the population standard deviation is known, and it is 3.8 tons. What is the 95% confidence interval for the population mean?Multiple Choice14.7 and 16.913.2 and 17.610.0 and 20.016.1 and 18.1McGrawHillEdecationNext4 of 10< Prev415 AMType here to search11/17/2019

Confidence interval:The (1-α) % confidence interval for population mean µ, when σ is known is given…

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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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Please answer this question with diagram A philanthropic organization helped a town in Africa dig several wells to gain access to clean water. Before the wells were in place, an average of 120 infants contracted typhoid each month. After the wells were installed, the philanthropic organization surveyed for nine months and found an average of 90 infants contracted typhoid per month. Assume that the population standard deviation is 40 and the number of infants that contract typhoid is normally distributed. a. Specify the null and alternative hypotheses to determine whether the average number of infants that contract typhoid has decreased since the wells were put in place. b. Calculate the value of the test statistic and the p-value. c. At the 5% significance level, can you conclude that the number of babies falling ill due to typhoid has decreased? Explain.
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Assume that population mean is to be estimated from the sample described. Use the sample results to approximate the margin of error and 95% confidence interval. n=49, x=55.1 seconds, s=4.8 seconds The margin of error is nothing seconds.
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