b) To estimate average water quality of wells, a survey of residential wells was carried out in the rural parts of Avalon. The population of 13,345 wells was identified from assessment records. Three strata were created. The first stratum includes wells in farms with animals, the second stratum includes wells in farms without animals, and the third stratum includes wells in houses. A random sample of wells was selected from each stratum and the water quality was tested for their sodium (Na) concentration (mg/L). tratum Farms with animals Farms without animals Houses Population Sample Size 150 100 250 Size 2,365 1,297 9,683 Sample Mean Na Concentration 237.3 245.6 220.1 Standard Deviation Na Concentration 41.45 37.62 51.23 Find an approximate 95% confidence interval for the average Na difference between the two types of farm wells. Interpret the confidence interval.
b) To estimate average water quality of wells, a survey of residential wells was carried out in the rural parts of Avalon. The population of 13,345 wells was identified from assessment records. Three strata were created. The first stratum includes wells in farms with animals, the second stratum includes wells in farms without animals, and the third stratum includes wells in houses. A random sample of wells was selected from each stratum and the water quality was tested for their sodium (Na) concentration (mg/L). tratum Farms with animals Farms without animals Houses Population Sample Size 150 100 250 Size 2,365 1,297 9,683 Sample Mean Na Concentration 237.3 245.6 220.1 Standard Deviation Na Concentration 41.45 37.62 51.23 Find an approximate 95% confidence interval for the average Na difference between the two types of farm wells. Interpret the confidence interval.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
Please no written by hand solution and no img

Transcribed Image Text:b) To estimate average water quality of wells, a survey of residential wells
was carried out in the rural parts of Avalon. The population of 13,345
wells was identified from assessment records. Three strata were created.
The first stratum includes wells in farms with animals, the second
stratum includes wells in farms without animals, and the third stratum
includes wells in houses. A random sample of wells was selected from
each stratum and the water quality was tested for their sodium (Na)
concentration (mg/L).
Stratum
Farms with animals
Farms without animals
Houses
Population Sample
Size
150
100
250
Size
2,365
1,297
9,683
Sample Mean
Na Concentration
237.3
245.6
220.1
Standard Deviation
Na Concentration
41.45
37.62
51.23
Find an approximate 95% confidence interval for the average Na
difference between the two types of farm wells. Interpret the confidence
interval.
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