A city planner wants to estimate the average monthly residential water usage in the city. He selected a random sample of 38 households from the city, which gave the mean water usage to be 3406.60 gallons over a one-month period. Based on earlier data, the population standard deviation of the monthly residential water usage in this city is 387.30 gallons. Make a 97% confidence interval for the average monthly residential water usage for all households in this city.

A city planner wants to estimate the average monthly residential water usage in the city. He selected a random sample of 38 households from the city, which gave the mean water usage to be 3406.60 gallons over a one-month period. Based on earlier data, the population standard deviation of the monthly residential water usage in this city is 387.30 gallons. Make a 97% confidence interval for the average monthly residential water usage for all households in this city.

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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Question

I only got these 2 questions partially correct i need help on both please please please please please please please please please

A city planner wants to estimate the average
monthly residential water usage in the city. He
selected a random sample of 38 households from
the city, which gave the mean water usage to be
3406.60 gallons over a one-month period. Based
on earlier data, the population standard deviation
of the monthly residential water usage in this city
is 387.30 gallons. Make a 97% confidence interval
for the average monthly residential water usage
for all households in this city.
Round your answers to two decimal places.
i
3207.15
to
3543.05
gallons

The high price of medicines is a source of major
expense for those seniors in the United States who
have to pay for these medicines themselves. A
random sample of 1600 seniors who pay for their
medicines showed that they spent an average of
$4300 last year on medicines with a standard
deviation of $500. Make a 90% confidence
interval for the corresponding population mean.
Round your answers to cents.
i
to $
4320.57
%24

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