HW01_sol_X

# HW01_sol_X - 1 2 3 4 5 6 7 8 9 8 5 3 9 11 2 1 8 12 Cost, \$...

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Bus 1 8 859 2 5 682 3 3 471 4 9 708 5 11 1,094 6 2 224 7 1 320 8 8 651 9 12 1,049 There is a positive relation between the two variables Correlation coefficient calculation: X Y XY 8 859 64 737,881 6,872 5 682 25 465,124 3,410 3 471 9 221,841 1,413 9 708 81 501,264 6,372 11 1,094 121 1,196,836 12,034 2 224 4 50,176 448 1 320 1 102,400 320 8 651 64 423,801 5,208 12 1,049 144 1,100,401 12,588 - - - - - Totals 59 6,058 513 4,799,724 48,665 - - - - - n = 9 Correlation coefficient: 0.938 Age, Years Cost, \$ X 2 Y 2 0 2 4 6 8 10 12 14 0 200 400 600 800 1,000 1,200 Cost versus Age Age, Years Cost, \$

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Week 1 6.8 275 2 3.3 142 3 4.1 168 4 4.2 197 5 4.8 215 6 3.9 188 7 4.9 241 8 7.7 295 9 3.1 125 10 5.9 266 11 5.0 200 There is a positive relation between the two variables Correlation coefficient calculation: X Y X2 Y2 XY 6.8 275 46.2 75,625 1,870 3.3 142 10.9 20,164 469 4.1 168 16.8 28,224 689 4.2 197 17.6 38,809 827 4.8 215 23.0 46,225 1,032 3.9 188 15.2 35,344 733 4.9 241 24.0 58,081 1,181 7.7 295
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## This note was uploaded on 06/18/2011 for the course IEOR 4307 taught by Professor Dr.kosrowdehnad during the Summer '10 term at Columbia.

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HW01_sol_X - 1 2 3 4 5 6 7 8 9 8 5 3 9 11 2 1 8 12 Cost, \$...

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