The standard deviation for a population is o = 14.8. A sample of 25 observations selected from this population gave a mean ec to 137.30. The population is known to have a normal distribution. Round your answers to two decimal places.
The standard deviation for a population is o = 14.8. A sample of 25 observations selected from this population gave a mean ec to 137.30. The population is known to have a normal distribution. Round your answers to two decimal places.
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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For the one with black ink, i just need help with c please. I have tried solving it and keep getting my answer wrong.
Transcribed Image Text:The standard deviation for a population is o = 14.8. A sample of 25 observations selected from this population gave a mean equal
to 137.30. The population is known to have a normal distribution.
Round your answers to two decimal places.
a Make a 99% co
for I
c. Determine a 90% confidence interval for µ.
i
i
Transcribed Image Text: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
to
i
gallons
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