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Category > Statistics Posted 02 May 2017 My Price 7.00

Arsenic in groundwater

 

Arsenic in groundwater. Environmental Science & Technology (Jan. 2005) reported on a study of the reliability of a commercial kit designed to test for arsenic in groundwater. The field kit was used to test a sample of 328 groundwater wells in Bangladesh. In addition to the arsenic level (in micrograms per liter), the latitude (degrees), longitude (degrees), and depth (feet) of each well were measured. The data are saved in the ASWELLS file. The first and last five observations are listed in the following table:

a. Write a first-order model for arsenic level ( y ) as a function of latitude, longitude, and depth.

b. Use the method of least squares to fit the model to the data.

c. Give practical interpretations of the β estimates.

d. Find the standard deviation s of the model, and interpret its value.

e. Find and interpret the values of R2 and .

f. Conduct a test of overall model utility at a = .05.

g. On the basis of the results you obtained in parts d – f, would you recommend using the model to predict arsenic level ( y )? Explain.

 

 

 
 

Answers

Alpha Geek
(8)
Status NEW Posted 02 May 2017 12:05 PM My Price 7.00

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Attachments

file 1493727329-answer1.docx preview (420 words )
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