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recorded with mean 90%. If the population standard deviation is known to be 15%, estimate the mean percentage increase with 95% level of confidence.

recorded with mean 90%. If the population standard deviation is known to be 15%, estimate the mean percentage increase with 95% level of confidence.

MATLAB: An Introduction with Applications
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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The rising costs of electricity is a concern for households. Electricity costs have increased over the past five years. A survey from 250 households was conducted with the percentage increase recorded with mean 90%. If the population standard deviation is known to be 15%, estimate the mean percentage increase with 95% level of confidence.
Transcribed Image Text:The rising costs of electricity is a concern for households. Electricity costs have increased over the past five years. A survey from 250 households was conducted with the percentage increase recorded with mean 90%. If the population standard deviation is known to be 15%, estimate the mean percentage increase with 95% level of confidence.
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