Homework Help: statistics

Posted by hani on Monday, May 25, 2009 at 1:17pm.

Hi all i have this assignment,please help me :D
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1.The following table presents the monthly consumption (C) and income (I) of 5 families, in Jordanian Dinars:

(C) (I)

290 400
210 230
200 200
150 220
250 450

A) Plot the data;

B) Write the estimated simple regression model;

C) What is the estimated consumption when the income is 500?

statistics - drwls, Monday, May 25, 2009 at 2:19pm
The plotting and regression-fitting tool at this site should help you:
http://science.kennesaw.edu/~plaval/applets/LRegression.html

Using this site and entering the C and I values in a table provided, I get the best linear fit to be
C = 0.368 I + 131.524

For I = 500, this results in C = 315.5
statistics (correction) - drwls, Monday, May 25, 2009 at 2:26pm
I made a mistake reading the results of that Java applet that was referenced.

The constant value in that regression fit should be
b = 109.59107,
which makes the best fit
C = 0.368 I + 109.59
Fot I = 500, C = 293.6
statistics - hani, Monday, May 25, 2009 at 5:11pm
thank you so much,but i need the solution i know its can be done on that site but the teacher wants to see the solution in details !
statistics - drwls, Monday, May 25, 2009 at 9:50pm
You will find the formulas at
http://people.hofstra.edu/Stefan_Waner/realworld/calctopic1/regression.html

The plotting of the graph is also something you will have to do yourself.

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