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The 95 % confidence interval for the mean lead content per litre of waste water produced by her company then is

The 95 % confidence interval for the mean lead content per litre of waste water produced by her company then is

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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A researcher wants to investigate the amount of lead per litre of waste water produced by her company. She plans to use statistical methods to estimate the population mean of lead content per litre of water. Based on previous recordings she assumes that the lead content is normally distributed with a standard deviation of 20mg per litre. She decides that she can afford a sample size of 500, but not larger, and with this sample finds a sample mean of 641mg of lead per litre. The 95 % confidence interval for the mean lead content per litre of waste water produced by her company then is ... A) (630.25, 633.75) B) (639.25, 642.75) C) (629.81, 634.19) D) (630.04, 633.96)
Transcribed Image Text:A researcher wants to investigate the amount of lead per litre of waste water produced by her company. She plans to use statistical methods to estimate the population mean of lead content per litre of water. Based on previous recordings she assumes that the lead content is normally distributed with a standard deviation of 20mg per litre. She decides that she can afford a sample size of 500, but not larger, and with this sample finds a sample mean of 641mg of lead per litre. The 95 % confidence interval for the mean lead content per litre of waste water produced by her company then is ... A) (630.25, 633.75) B) (639.25, 642.75) C) (629.81, 634.19) D) (630.04, 633.96)
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