Math 221 Lab3

# Math 221 Lab3 - Name Mahanaim Peterson Subject Week 3 Lab 3...

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Name:  Mahanaim Peterson Subject:  Week 3 Lab 3 Section:  Math221 Date: May 20, 2007 Part 1 - Analysis   Sugar (x) and Calories (y)  Sugar vs. Calories y = 4.0934x + 105.03 R 2 = 0.305 R = 0.552 0 50 100 150 200 250 300 0 5 10 15 20 25 30 Sugar (grams) Calories Using the Excel function of correlation coefficient ( R (=CORREL(D2:D85,E2:E85) = 0.55226) it gave me the answer of  0.552. The relationship of X (sugar) and Y (calories) is positive correlation.  I  was able to decide that the graph and regression line is positive after

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finding out the correlation coefficient.  It was a moderate correlation  because my result (0.552) is between .5 and .75.  The graph also  shows that about 30% of the variation increase in the Calories is from  the increase of Sugar (grams).  The other 70% are variations from  other factors.
Sugar (x) and Cost (y)  Sugar vs. Cost y = 0.6987x + 20.791 R 2 = 0.2219 R = 0.4711 0 10 20 30 40 50 60 0 5 10 15 20 25 30 Sugar Cost Using the Excel function of square root (=SQRT(0.2219) = 0.4711) it

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