An electrochemical engineer has manufactured a new type of fuel cell (a type of battery) which has to undergo testing to prove its duration: the time it takes to go from fully charged to completely uncharged, under a fixed nominal load. From the computational simulation models she has, the variance of the duration is o2 = 4 h² (hours squared) but she wants to estimate the mean duration time u. To achieve this she is determined to do the tests multiple times in independent but identical conditions. Can you find what is the smallest number of these tests that she has to do in order for her estimated mean duration to be within ±0.2 h tolerance of the true mean with 95% certainty?

An electrochemical engineer has manufactured a new type of fuel cell (a type of battery) which has to undergo testing to prove its duration: the time it takes to go from fully charged to completely uncharged, under a fixed nominal load. From the computational simulation models she has, the variance of the duration is o2 = 4 h² (hours squared) but she wants to estimate the mean duration time u. To achieve this she is determined to do the tests multiple times in independent but identical conditions. Can you find what is the smallest number of these tests that she has to do in order for her estimated mean duration to be within ±0.2 h tolerance of the true mean with 95% certainty?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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