2- We would like to survey a number of electric vehicles (EVs) to estimate the average distance EVs travel on a single charge of batteries. A previous similar study gave a sample standard deviation of 80 Kilometers. (A) How many EVs should we survey to be 95% confident that our sample mean will not deviate from the true average by more than 50 Kilometers. (B) How many EVs should we survey to be 95% confident that our sample mean will not deviate from the true average by more than 20 Kilometers.

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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2- We would like to survey a number of electric vehicles (EVs) to estimate the average distance EVs
travel on a single charge of batteries. A previous similar study gave a sample standard deviation of 80
Kilometers.
(A) How many EVs should we survey to be 95% confident that our sample mean will not deviate from
the true average by more than 50 Kilometers.
(B) How many EVs should we survey to be 95% confident that our sample mean will not deviate from
the true average by more than 20 Kilometers.
Transcribed Image Text:2- We would like to survey a number of electric vehicles (EVs) to estimate the average distance EVs travel on a single charge of batteries. A previous similar study gave a sample standard deviation of 80 Kilometers. (A) How many EVs should we survey to be 95% confident that our sample mean will not deviate from the true average by more than 50 Kilometers. (B) How many EVs should we survey to be 95% confident that our sample mean will not deviate from the true average by more than 20 Kilometers.
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