The average consumption of electricity of a country during 2002 to 2010 (9 years) is 64503.33 (GWh) with a sample standard deviation of 9218.191 (GWh). The consumption of electricity is approximately normally distributed. Estimate at the 99% confidence interval for the average consumption of electricity. Show all relevant steps and calculations. (b) Explain with the help of an example that if one gradually increases the sample size, without increasing the confidence level the estimation of confidence interval becomes narrower and hence the estimation of population mean become more precise.
The average consumption of electricity of a country during 2002 to 2010 (9 years) is 64503.33 (GWh) with a sample standard deviation of 9218.191 (GWh). The consumption of electricity is approximately normally distributed. Estimate at the 99% confidence interval for the average consumption of electricity. Show all relevant steps and calculations. (b) Explain with the help of an example that if one gradually increases the sample size, without increasing the confidence level the estimation of confidence interval becomes narrower and hence the estimation of population mean become more precise.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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- a) The average consumption of electricity of a country during 2002 to 2010 (9 years) is 64503.33 (GWh) with a sample standard deviation of 9218.191 (GWh). The consumption of electricity is approximately
normally distributed. Estimate at the 99% confidence interval for the average consumption of electricity. Show all relevant steps and calculations.
(b) Explain with the help of an example that if one gradually increases the sample size, without increasing the confidence level the estimation of confidence interval becomes narrower and hence the estimation of population mean become more precise.
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