A researcher makes a research about the life time of batteries which have a normal distribution with mean of 50 hours and variance of 9 hours. In order to understand the life time of batteries s/he randomly selected 9 batteries and calculate the sample mean as 48 hours and standard deviation of 5 hours. Construct 90 % confidence interval for the true population mean of life time of batteries.

A researcher makes a research about the life time of batteries which have a normal distribution with mean of 50 hours and variance of 9 hours. In order to understand the life time of batteries s/he randomly selected 9 batteries and calculate the sample mean as 48 hours and standard deviation of 5 hours. Construct 90 % confidence interval for the true population mean of life time of batteries.

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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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.

Question

A researcher makes a research about the life time of batteries which have a normal distribution with mean of 50
hours and variance of 9 hours. In order to understand the life time of batteries s/he randomly selected 9 batteries
and calculate the sample mean as 48 hours and standard deviation of 5 hours. Construct 90 % confidence interval for
the true population mean of life time of batteries.
O (46.04, 49.96)
O (47.09 , 48.91)
O (46.61 , 49.39)
O (46.36 , 49,65)
3831

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